[] Array initializer/literal syntax. JavaScript Boolean. JavaScript DataView.getFloat32() Method; JavaScript dataView.getUint32() Method; JavaScript dataView.setFloat32() Method; JavaScript dataView.setInt32() Method; JavaScript dataView.setUint32() Method; JavaScript Boolean and dataView Complete Reference How can I validate an email address in JavaScript? The exec () method is a RegExp expression method. But an added advantage in JavaScript is that we can combine short-circuit evaluation with the truthy/falsy trick described above to assign variables in a nifty way. When would we even want to force boolean conversion? Some people shy away from !! JavaScript - Operators, Let us take a simple expression 4 + 5 is equal to 9. Get started, freeCodeCamp is a donor-supported tax-exempt 501(c)(3) nonprofit organization (United States Federal Tax Identification Number: 82-0779546). the truthy expression. {} Object initializer/literal syntax. Examples In this case, x1 and x2 reserve the boolean values - YES and NO. The search () method uses an expression to search for a match, and returns the position of the match. How can I use a VPN to access a Russian website that is banned in the EU? In JavaScript, the operator is a little bit trickier and more powerful. Boolean Expression can be represented in two ways Conditional Expressions For example, If a > b{ cout<<"a is greater than b"; } Here a > b is a conditional expression that can be either True or False. It is useful in controlling program flow using conditional statements like if else, switch, while loop, etc. If youre new to JavaScript, youll come across various keywords, syntax sugar, and shorthands that make you scratch your head. Boolean means True or False. So your original statement is equivalent to if ( (x > y && 1 > z) || (x <= y && 0 > z)) Share Follow edited May 20, 2013 at 18:39 answered May 20, 2013 at 18:33 Ben McCormick Alternately, true is represented by 1 and false by 0. Your email address will not be published. When it is, it returns a Boolean value. constructor. false. Ready to optimize your JavaScript with Rust? Boolean Values Very often, in programming, you will need a data type that can only have one of two values, like YES / NO ON / OFF TRUE / FALSE For this, JavaScript has a Boolean data type. The boolean in javascript is a primitive data type that has two values true representing yes and false representing no. If this is true or truthy, it returns it immediately (which is why we get word in the first case & true in the second case). If a value can be converted to true, the value is so-called This could be useful when combined with an iteration method. ?` unparenthesized within `||` and `&&` expressions, SyntaxError: for-in loop head declarations may not have initializers, SyntaxError: function statement requires a name, SyntaxError: identifier starts immediately after numeric literal, SyntaxError: invalid assignment left-hand side, SyntaxError: invalid regular expression flag "x", SyntaxError: missing ) after argument list, SyntaxError: missing ] after element list, SyntaxError: missing } after function body, SyntaxError: missing } after property list, SyntaxError: missing = in const declaration, SyntaxError: missing name after . so-called falsy. Why does Cauchy's equation for refractive index contain only even power terms? In JavaScript, there is often implicit type coercion to boolean. 0 "" null undefined false NaN // (short for not a number) 6 Falsey Values in Javascript By definition, a boolean has two possible values: true or false. If expr1 can be converted to true, returns Happy coding! The !! Which equals operator (== vs ===) should be used in JavaScript comparisons? !x negates x twice, which converts x to a boolean using the same algorithm as above. JavaScript uses the double ampersand ( &&) to represent the logical AND operator. JavaScript expects a boolean value Even if they do not have a "value" of false, these values will be translated (or "coerced") to false when evaluated in a boolean expression. The Boolean() function: Boolean(x) uses the same algorithm as above to convert x. The logical AND expression is a short-circuit operator. How to toggle a boolean using JavaScript ? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. To learn more, see our tips on writing great answers. But first, let's see what happens with boolean values. "); Sometimes you want to force a conversion to a boolean. One instance is when you want the ensure the return type of a function is a boolean. Frequently asked questions about MDN Plus. 2 < 4. For example, the condition in the following if statement evaluates to false: Do not use a Boolean object to convert a non-boolean value to a boolean value. // Logs "called B" due to the function call, // then logs true (which is the resulting value of the operator), // returns true, because && is executed first, // returns false, because grouping has the highest precedence, Enumerability and ownership of properties, Error: Permission denied to access property "x", RangeError: argument is not a valid code point, RangeError: repeat count must be less than infinity, RangeError: repeat count must be non-negative, RangeError: x can't be converted to BigInt because it isn't an integer, ReferenceError: assignment to undeclared variable "x", ReferenceError: can't access lexical declaration 'X' before initialization, ReferenceError: deprecated caller or arguments usage, ReferenceError: reference to undefined property "x", SyntaxError: "0"-prefixed octal literals and octal escape seq. This set of expressions often involve the usage of logical operators && (AND), || (OR). SyntaxError: Unexpected '#' used outside of class body, SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**', SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. (see operator precedence). They save one of two values: True or False. There are. How to check whether a string contains a substring in JavaScript? The, (double bang) operator can be used to accomplish this. Content available under a Creative Commons license. && assigns the second value if the first value is truthy. Double NOT: ! JavaScript allows any type to be used in a boolean context and automatically converts types to booleans according to some rules. In JavaScript, Boolean is used as a function to get the value of a variable, object, conditions, expressions, etc. For example, the algebra expression. because they think its confusing, but youll still come across it fairly often. evaluated, hence any side effects of doing so do not take effect (e.g., if If you need to put this into a function, you could try: Javascript will try to parse your original statement from left to right and you'll end up comparing z to a boolean value which will then be parsed to a number (0 or 1). Now the thing is what is logic high and logic low? . Wherever JavaScript expects a statement, you can also write an expression. Overview. The string is true if and only if the length of it is a non-zero integer. I was hoping that JavaScript would actually allow this kind of concise boolean expression syntax. Expressions that evaluate to the boolean value true or false are considered to be logical expressions. Boolean Expressions in JavaScript. Otherwise. So you end up with the same truthiness, but you are guaranteed that the result is a boolean. true: Get certifiedby completinga course today! I'm trying to check whether the variable y is less than x and greater than z, but this boolean expression is returning false for some reason. operands, so if this operator is used with non-Boolean values, it will return a Thanks for contributing an answer to Stack Overflow! Does JavaScript allow boolean expressions to be written concisely like this? filter out null or undefined, consider using Exclusive OR means that either operand one is true or operand two is true, but . in boolean expressions. Visit Mozilla Corporations not-for-profit parent, the Mozilla Foundation.Portions of this content are 19982022 by individual mozilla.org contributors. More accurately, a variable or an object having . When you write (x > y > z), this is equivalent to ((x>y)>z), so you're comparing a boolean (x>y) to z. It uses in boolean expressions such as conditional expressions and equality operators. is really just a shorthand for Boolean([value]). Better way to check if an element only exists in one array. this answer is the best, as its concise, it gives the solution and explains why the syntax used by the OP is valid but has a different meaning in JS, bravo! How to generate a random boolean using JavaScript ? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. That's not as concise as the original, unfortunately. JavaScript booleans can have one of two values: true or Boolean is generally used in conditional statements or at places when we have to control the flow example loops, if-else, switch, etc. If you only need to In Javascript truthy and falsy values are not only true and false, but any data which evaluates to boolean expression. Logical OR (||) - JavaScript | MDN Logical OR (||) The logical OR ( ||) (logical disjunction) operator for a set of operands is true if and only if one or more of its operands is true. expr is a function call, the calling never takes place). If they were omitted, the interpreter would continue executing each statement in each of the following cases. var a1 = true; var a2 = false; Note: Below variables are initialized with strings not boolean values. The bigint is the primitive type like number, string, symbol, boolean undefined, and null. Javascript: Why use Logical Operators along with Comparison Operator? We are passing these above-mentioned values by assigning them to different variables var1 to var6 and then displaying . The value passed as the first parameter is converted to a boolean value, if necessary. Javascript accepts almost any program we give it, even ones that do odd things. /e/.exec("The best things in life are free!"); AND Operator in Javascript symbolized as && The AND operator in Javascript is represented in symbolic form with two ampersands &&. . Note: If you use this operator to provide a default value to some @AndersonGreen I don't know if it helps, but I added a function that could do the same as what the comparison is (in either ascending or descending order), with as many numbers as you pass to the function. coerces the value to the negation of its truthy/falsy evaluation, and the second ! We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. switch (expression) { case condition 1: statement (s) break; case condition 2: statement (s) break; . The Boolean () Function happens because the value of the operator is already determined after the evaluation of SyntaxError: test for equality (==) mistyped as assignment (=)? Boolean Expression is the expression that returns true or false. System.out.println("You're a wizard, Harry! Consider the pseudocode below. You cannot use a statement in place of an expression. Syntax var result = x && y; // equivalent to x AND y Like the OR operator, the Boolean or logical AND operator is used to evaluate multiple Boolean operands. However, anything other than false is considered true. The above is an expression that when evaluated will produce 5. Not Parentheses; How it works. Use //# instead, TypeError: can't assign to property "x" on "y": not an object, TypeError: can't convert BigInt to number, TypeError: can't define property "x": "obj" is not extensible, TypeError: can't delete non-configurable array element, TypeError: can't redefine non-configurable property "x", TypeError: cannot use 'in' operator to search for 'x' in 'y', TypeError: invalid 'instanceof' operand 'x', TypeError: invalid Array.prototype.sort argument, TypeError: invalid assignment to const "x", TypeError: property "x" is non-configurable and can't be deleted, TypeError: Reduce of empty array with no initial value, TypeError: setting getter-only property "x", TypeError: X.prototype.y called on incompatible type, Warning: -file- is being assigned a //# sourceMappingURL, but already has one, Warning: 08/09 is not a legal ECMA-262 octal constant, Warning: Date.prototype.toLocaleFormat is deprecated, Warning: expression closures are deprecated, Warning: String.x is deprecated; use String.prototype.x instead, Warning: unreachable code after return statement. The first ! JavaScript supports the followin. All other values, including any object or the string false, create an object with an initial value of true. This means that if you define your false to be 0 everything other than 0 will be considered true. Check whether a string matches a regex in JS. Why do we use perturbative series if they don't converge? Truthy values will be evaluated as true. In Other programming languages, boolean values are true and false . It can only take the values true or false. Sometimes you want to force a conversion to a boolean. Literals Basic null, boolean, number, and string literals. For example, const a = true; const b = false; Note: If you wrap true or false in a quote, then they are considered as a string. this The this keyword refers to a special property of an execution context. But an added advantage in JavaScript is that we can combine short-circuit evaluation with the truthy/falsy trick described above to assign variables in a nifty way. How do I include a JavaScript file in another JavaScript file? Any object whose value is not undefined or null, including a Boolean object whose value is false, evaluates to true when passed to a conditional statement. Implicit Javascript booleans are values that evaluate to true or false in the context of a Javascript language structure like a while loop. If it is not true or truthy, it returns the second operand (which is why we get word in the third case). You can use the Boolean() function to find out if an expression is If value is omitted, 0, -0, null, false, NaN, undefined, or the empty string (""), the object has an initial value of false. Our mission: to help people learn to code for free. Each statement is a boolean expression involving the && operator. Instead, use Boolean as a function to perform this task: If you specify any object, including a Boolean object whose value is false, as the initial value of a Boolean object, the new Boolean object has a value of true. Multiple comparison operators in a JavaScript boolean expression. This article introduces a few of the most common boolean expression tricks I encountered when I began coding in JavaScript. In real life, a statement can be valid or invalid that is either true or false, in the same way, Boolean is a logical data type in JavaScript with any one of the two values possible at a time i.e either true or false. At a high level, an expression is a valid unit of code that resolves to a value. Example: boolean Variables var YES = true; var NO = false; Try it variable, be aware that any falsy value will not be used. If for example you have an if statement which checks a certain expression, that expression will be coerced to a boolean: There are only a few values that will be coerced to false: All other values will be coerced to true. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. If true, this will execute the function. Not the answer you're looking for? 'one' + 2 gives is 'one2'and so on. is true if and only if one or more of its operands is true. is truthy and then check the name property. It is typically used with boolean (logical) values. Enable JavaScript to view data. It is typically used with In JavaScript, regular expressions are often used with the two string methods: search () and replace (). Supported logical operators | Or & And! Using String search () With a Regular Expression : To explicitly convert its return value (or any expression in general) to the Here 4 and 5 are called operands and + is called the operator. The following expression uses the && operator: let result = a && b; Code language: JavaScript (javascript) If a can be converted to true, the && operator returns the b; otherwise, it returns the a. If a value can be converted to false, the value is Statements use the values produced by expressions to perform actions or to know the kind of action to execute. JavaScript:JavaScript1.document.write();2.JS3.HTMLdocument-html-(head,body)4.DOMwindow-(naviga JavaScript booleans can have one of two values: true or false. A Boolean function is a special kind of mathematical function f: Xn X of degree n, where X = {0, 1} is a Boolean domain and n is a non-negative integer. The variables listed below are boolean. const good = Boolean (expression); // use this const good2 =!! 10 Little Behaviours that Attract People to You Sunil Kumar in JavaScript in Plain English My Salary Increased 13 Times in 5 Years Here Is How I Did It Jakub Kozak in Geek Culture Stop Using "&&" for Conditional Rendering in React Without Thinking fatfish in JavaScript in Plain English It's 2022, Please Don't Just Use "console.log" Anymore Help Example: Here a1 and a2 stores the boolean value i.e. How can I fix it? The simplification process is similar to that of regular algebra. Mathematica cannot find square roots of some matrices? truthy. One instance is when you want the ensure the return type of a function is a boolean. It searches a string for a specified pattern, and returns the found text as an object. The replace () method returns a modified string where the pattern is replaced. The return type of hasFirstName below is the type of this.firstName: We can force hasFirstName to return a boolean: JavaScript, like many common languages, uses short-circuit evaluation in boolean expressions. There are two ways to achieve the same effect in JavaScript. If you need to know "yes" or "no" about something, then you would want to use the boolean function. When would we even want to force boolean conversion? The following example declares two variables and initializes their values to true and false: let completed = true ; let running = false; Code language: JavaScript (javascript) The boolean's literal values are case-sensitive. It performs a Boolean exclusive OR operation on each bit of its integer arguments. The logical OR (||) (logical disjunction) operator for a set of operands Do not use a Boolean object in place of a Boolean primitive. Both expressions are tested separately by JavaScript interpreter and then && operator compares the result of both. . Falsy values will be evaluated as false. These implicit values, since they're not strictly true or false, are commonly known as "truthy" or "falsy" (or "falsey"). Boolean Function: In the XSL stylesheet 1 strings are the arguments of the boolean() function. Boolean in javascript always evaluates to true or false values. https://developer.mozilla.org/en-US/docs/Glossary/Truthy, https://www.sitepoint.com/javascript-double-negation-trick-trouble/, https://medium.com/@edplatomail/js-double-bang-or-the-not-operator-part-40e55d089bf0, https://www.sitepoint.com/shorthand-javascript-techniques/, [] Link: https://www.lucidchart.com/techblog/2018/06/25/idiomatic-javascript-boolean-expression-tricks/ []. Short circuit means that the expr part above is not By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. freeCodeCamp's open source curriculum has helped more than 40,000 people get jobs as developers. We can use many methods to achieve our goal to obtain a Boolean from the string. JavaScript's expression is a valid set of literals, variables, operators, and expressions that evaluate a single value that is an expression. Falsy values will be evaluated as false. You typically need to invoke a Boolean function if you want to get a true/false type of response in JavaScript programming. It means that when you pass either true or false to the Boolean constructor, it'll create a Boolean object. Updated on Sep 2. > Logic high If the value of voltage/current at any te. The above is also an expression that when evaluated will produce: true. Boolean is a data type that stores only two values: true and false. Answer (1 of 2): In logic gates of Boolean algebra OR is a type of Gate which works as follows.. It's output logic will be high if any one of the input is logic highz otherwise logic low. The second part is a function call that has a side effect, nothing is "returned." The Boolean constructor returns true when passed a truthy value and returns false when passed a falsy value. Donations to freeCodeCamp go toward our education initiatives, and help pay for servers, services, and staff. (some falsy expression) && expr What does "use strict" do in JavaScript, and what is the reasoning behind it? Example e.g. Boolean Expressions in JavaScript. By definition, a boolean has two possible values: true or false. The problem is that your "concise" expression has a meaning in JavaScript, but a different one (see my answer). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A compound boolean expression is a boolean expression built out of smaller boolean expressions. To evaluate these expressions, JavaScript first evaluates the left part, then ONLY if the left part is true, evaluates the second part. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Introduction to JavaScript String to Boolean We may come across a situation while coding in javascript when we want to retrieve the Boolean value from the string which stores the values like "true", "false", "yes", "no", "1", "0", "on" or "off". case condition n: statement (s) break; default: statement (s) } The break statements indicate the end of a particular case. var a = (b = 1); // since (b = 1) is an assignment expression and not a statement, this is a perfectly acceptable line of code . Truthy values will be evaluated as true. In general - empty objects are evaluated to false, and non-empty objects are evaluated to true. (double bang) operator can be used to accomplish this. Can several CRTs be wired in parallel to one oscilloscope circuit? But after a closer look, we can see that it's just an ordinary sequence of tests: The first question mark checks whether age < 3.; If true - it returns 'Hi, baby!'.Otherwise, it continues to the expression after the colon ":", checking age < 18.; If that's true - it returns 'Hello!'. This is a function of degree 2 from the set of ordered pairs of Boolean . While using W3Schools, you agree to have read and accepted our, Returns the function that created JavaScript's Boolean prototype, Allows you to add properties and methods to the Boolean prototype, Converts a boolean value to a string, and returns the result. Find centralized, trusted content and collaborate around the technologies you use most. This is a nice little shorthand for: Live Editing HTML and CSS with Chrome DevTools, Installing Angular 2 and Other Dependencies, How to Make a Killer Data Dashboard with Google Sheets, Idiomatic JavaScript: Boolean Expression Tricks Javascript World, https://www.lucidchart.com/techblog/2018/06/25/idiomatic-javascript-boolean-expression-tricks/, Idiomatic JavaScript: Boolean Expression Tricks - Coding Videos, Idiomatic JavaScript: Boolean Expression Tricks. Introduction to the JavaScript BigInt. See example: The following expressions might seem equivalent, but they are not, because the If this.name is truthy, it will be returned. In JavaScript, booleans are the primitive data types that can either be true or false. If the conditions on both sides of && operator are true, the logical && operator returns true. negates that. This means that the True and False are . All values are truthy except the following values, which are defined as falsy: false, 0, "", null, undefined, and NaN This single value can be a number, a string, or a logical value depending on the expression. In this test, true is converted to 1, which isn't greater than 2. Basic expressions provide a drop down list of common expressions which are available to be used: Selecting Advanced from the dropdown shows a JavaScript expression window that allows any valid JavaScript Boolean expression to be entered. This could be useful when . The first, coerces the value to the negation of its truthy/falsy evaluation, and the second. Javascript will try to parse your original statement from left to right and you'll end up comparing z to a boolean value which will then be parsed to a number (0 or 1). The parser parse and tokenize the expression, for example one of your function requires REGISTED&(SPECIAL|INVITED) Expressions get compiled into JavaScript functions, offering the same performance as if it had been hand coded. Explanation: In this example, we shall demonstrate how Boolean works for all kinds of values such as integer (2), decimal (2.45), negative number (-33), any non-empty string value (string), boolean value (true), an operation which is having non zero expression (2 + 8 + 0.26). With the and operator it works in a similar way, but for and to be true, both operands need to be truthy. Utility library to parse, normalize and compare License expressions for Python using a boolean logic engine. !! Connect and share knowledge within a single location that is structured and easy to search. non-Boolean value. && operator is executed before the || operator It sounds extremely simple, but booleans are used all the time in JavaScript programming, and they are extremely useful. The operator takes two operands, and the resulting expression is true if both operands are true individually. Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. When comparing two strings, "2" will be greater than "12", because (alphabetically) 1 is less than 2. If so, what is the correct syntax? operator, SyntaxError: redeclaration of formal parameter "x". Example Let, F(A, B) = A B . Argument Type Result Undefined false Null false Boolean The result equals the input argument (no conversion). One way to explicitly convert a non-boolean value to a boolean one in JavaScript is to use the global Boolean object as a function. negates that. It may be difficult at first to grasp what's going on. in terms of true or false. In fact, this rule is applied to all boolean values. By using the following code, you can explicitly get the boolean conversion of a variable or expression: var asBoolean = Boolean (someVariable); The variable asBoolean is now guaranteed to have a boolean value. There is also a native JavaScript object that wraps around a value. It can have only two values: true or false. By default when switching from the Basic to the Advanced view the equivalent JavaScript will be shown. python licensing boolean-expression spdx spdx-license license-expression. be converted to a boolean primitive. This is done by testing the truthy-falsy value of an object. A Boolean expression is a Java expression that returns a Boolean value: true or false. will be returned. So your original statement is equivalent to. So, an expression is a combination of values. When a value is coerced to a boolean, we also call that either falsy or truthy. JavaScript Boolean Methods and Properties Previous Next The rubber protection cover does not pass through the hole in the rim. boolean (logical) values. There are four possible logical combinations: alert( true || true ); // true alert( false || true ); // true alert( true || false ); // true alert( false || false ); // false assigns the second value if the first value is truthy. In JavaScript, there is often implicit type coercion to boolean. "short-circuit" evaluation using the following rule: (some truthy expression) || expr is short-circuit evaluated to @ben336: Right I guess by "makes no sense" I meant, like you said, that it wasn't the original intent. It describes the way how to derive Boolean output from Boolean inputs. How do I remove a property from a JavaScript object? true and false respectively. This is useful when we want to compare values to find answers. Booleans are a primitive datatype commonly used in computer programming languages. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. JavaScript allows us to create a compound boolean expression using the logical AND operator, &&. Primary expressions Primary expressions are the simplest expressions. Expressions and operators Expressions and operators Previous Next This chapter describes JavaScript's expressions and operators, including assignment, comparison, arithmetic, bitwise, logical, string, ternary and more. We accomplish this by creating thousands of videos, articles, and interactive coding lessons - all freely available to the public. Each statement is an expression evaluation. corresponding boolean value, use a double NOT Booleans are a primitive datatype commonly used in computer programming languages. Something can be done or not a fit? "Truthy" values usually come from objects with a defined value or structure. It will really only work for numbers in the same ascending/descending order. For example: let b = new Boolean ( false ); Code language: JavaScript (javascript) To get the primitive value back, you call the valueOf () method of the Boolean object as follows: console .log (b.valueOf ()); // false. Falsy values will be evaluated as. The followings are boolean variables. function The logical OR expression is evaluated left to right, it is tested for possible A JavaScript boolean has only two values - it can either be true or false. A JavaScript Boolean represents one of two values: true or false. These expressions have the highest precedence (higher than operators ). Basic keywords and general expressions in JavaScript. Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? One way that type coercion is used is with the use of the or (||) and and (&&) operators: As you can see, the or operator checks the first operand. You as the developer have control of which data can be accessed and the functions that can be called. It would be better if I could create a function that would actually be able to parse "concise" boolean expressions like the one above. Number The result is false if the argument is +0, 0, or NaN; otherwise the result is true. Which kind of makes sense but clearly isn't what the OP intended. @Ocelot20 thats correct, but JS will actually cast it to a number for the conversion, so its really equivalent to the statement in my updated answer. QGIS expression not working in categorized symbology, If he had met some scary fish, he would immediately return to the surface. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. Does a 120cc engine burn 120cc of fuel a minute? JavaScript,javascript,arrays,boolean-expression,Javascript,Arrays,Boolean Expression, falsetrue > !! These are some of the JavaScript boolean expression nuances I found most helpful to know about when first starting to code in JavaScript. Learn to code for free. Save my name, email, and website in this browser for the next time I comment. For instance, we can write expressions like: '6' - 1 and get 5. Javascript multiple comparison expressions syntax, comparing multiple variables at same time in javascript, Value comparision on javascript, but showing incorrect result, Error while using Nullish coalescing operator operator. 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