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  1. const - JavaScript | MDN

    The const declaration declares block-scoped local variables. The value of a constant can't be changed through reassignment using the assignment operator, but if a constant is an object, its properties can be added, updated, or removed.... Try it Syntax js const name1 = value1; const name1...way to access the variable). js if (true) const a = 1; // SyntaxError:...

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  2. FileType.JS Field - GroupDocs.Comparison for .N...

    JavaScript Programming Language format...IPY Field JAVA Field JPEG Field JS Field JSCSRC Field JSHINTRC Field...YAML Field YML Field FileType JS Field JavaScript Programming...

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  3. for...of - JavaScript | MDN

    The for...of statement executes a loop that operates on a sequence of values sourced from an iterable object. Iterable objects include instances of built-ins such as Array, String, TypedArray, Map, Set, NodeList (and other DOM collections), as well as the arguments object, generators produced by generator functions, and user-defined iterables.... Try it Syntax js for (variable of iterable) statement...Otherwise, you can use let . js const iterable = [10, 20, 30];...

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  4. Arrow function expressions - JavaScript | MDN

    An arrow function expression is a compact alternative to a traditional function expression, with some semantic differences and deliberate limitations in usage:... Try it Syntax js () => expression param => expression...and always require parentheses: js (a, b, ...r) => expression (a...

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  5. SyntaxError: cannot use `??` unparenthesized wi...

    The JavaScript exception "cannot use ?? unparenthesized within || and && expressions" occurs when an nullish coalescing operator is used with a logical OR or logical AND in the same expression without parentheses....to parenthesize the operands: js a ?? b || c; a || b ?? c; a ...parenthesizing either side explicitly: js (a ?? b) || c; a ?? (b && c);...

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  6. TypeError: "x" is not a function - JavaScript |...

    The JavaScript exception "is not a function" occurs when there was an attempt to call a value from a function, but the value is not actually a function....is a typo in the method name: js const x = document.getElementByID("foo");...function name is getElementById : js const x = document.getElementById("foo");...

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  7. Block statement - JavaScript | MDN

    A block statement is used to group zero or more statements. The block is delimited by a pair of braces ("curly braces") and contains a list of zero or more statements and declarations.... Try it Syntax js { StatementList } StatementList...the block itself. For example: js var x = 1; { var x = 2; } console...

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  8. Less than (<) - JavaScript | MDN

    The less than (<) operator returns true if the left operand is less than the right operand, and false otherwise.... Try it Syntax js x < y Description The operands...the following relationships: js x < y === !(x >= y); x <= y ===...

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  9. URL Pattern API - Web APIs | MDN

    The URL Pattern API defines a syntax that is used to create URL pattern matchers. These patterns can be matched against URLs or individual URL components. The URL Pattern API is used by the URLPattern interface....js . Fixed text and capture groups...but they can be overwritten. js // A pattern matching some fixed...

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  10. new - JavaScript | MDN

    The new operator lets developers create an instance of a user-defined object type or of one of the built-in object types that has a constructor function.... Try it Syntax js new constructor new constructor()...object Foo might look like this: js function Foo(bar1, bar2) { this...

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