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  1. Grouping operator ( ) - JavaScript | MDN

    The grouping ( ) operator controls the precedence of evaluation in expressions. It also acts as a container for arbitrary expressions in certain syntactic constructs, where ambiguity or syntax errors would otherwise occur.... Try it Syntax js (expression) Parameters expression...multiplication and division. js const a = 1; const b = 2; const...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  2. Logical AND (&&) - JavaScript | MDN

    The logical AND (&&) (logical conjunction) operator for a set of boolean operands will be true if and only if all the operands are true. Otherwise it will be false.... Try it Syntax js x && y Description Logical AND...and returns them as they are: js result = "" && "foo"; // result...

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  3. Inequality (!=) - JavaScript | MDN

    The inequality (!=) operator checks whether its two operands are not equal, returning a Boolean result. Unlike the strict inequality operator, it attempts to convert and compare operands that are of different types.... Try it Syntax js x != y Description The inequality...always give the same result: js x != y; !(x == y); For details...

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  4. Logical OR (||) - JavaScript | MDN

    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. It is typically used with boolean (logical) values. When it is, it returns a Boolean value. However, the || operator actually returns the value of one of the specified operands, so if this operator is used with non-Boolean values, it will return a non-Boolean value.... Try it Syntax js x || y Description If x can be...the first operand. See example: js function A() { console.log("called...

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  5. Lexical grammar - JavaScript | MDN

    This page describes JavaScript's lexical grammar. JavaScript source text is just a sequence of characters — in order for the interpreter to understand it, the string has to be parsed to a more structured representation. The initial step of parsing is called lexical analysis, in which the text gets scanned from left to right and is converted into a sequence of individual, atomic input elements. Some input elements are insignificant to the interpreter, and will be stripped after this step — they include white space and comments. The others, including identifiers, keywords, literals, and punctuators (mostly operators), will be used for further syntax analysis. Line terminators and multiline comments are also syntactically insignificant, but they guide the process for automatic semicolons insertion to make certain invalid token sequences become valid.... For example: js function comment() { // This...can use it on a single line: js function comment() { /* This...

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  6. Indexed collections - JavaScript | MDN

    This chapter introduces collections of data which are ordered by an index value. This includes arrays and array-like constructs such as Array objects and TypedArray objects....statements create equivalent arrays: js const arr1 = new Array(element0...of the following can be used: js // This... const arr1 = new Array(arrayLength);...

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  7. SyntaxError: missing ) after condition - JavaSc...

    The JavaScript exception "missing ) after condition" occurs when there is an error with how an if condition is written. It must appear in parenthesis after the if keyword....after the if keyword, like this: js if (condition) { // do something...you parenthesis in your code. js if (Math.PI < 3 { console.log("wait...

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  8. in - JavaScript | MDN

    The in operator returns true if the specified property is in the specified object or its prototype chain.... Try it Syntax js prop in object #prop in object...syntax allows you to shorten: js class C { #x; static isC(obj)...

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  9. Subtraction (-) - JavaScript | MDN

    The subtraction (-) operator subtracts the two operands, producing their difference.... Try it Syntax js x - y Description The - operator...Examples Subtraction using numbers js 5 - 3; // 2 3 - 5; // -2 Other...

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  10. GitHub - mdn/bob: Builder of Bits aka The MDN W...

    Builder of Bits aka The MDN Web Docs interactive examples, example builder - mdn/bob...js webpack.config.js View all files Repository...examples editor |--> css |--> js |--> media # media used only...

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