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  1. SyntaxError: illegal character - JavaScript | MDN

    The JavaScript exception "illegal character" occurs when the lexer reads a character that's not part of a string literal, and the character cannot constitute a valid token in the language.... js “This looks like a string”; //...looks like it This should work: js "This is actually a string";...

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  2. Using promises - JavaScript | MDN

    A Promise is an object representing the eventual completion or failure of an asynchronous operation. Since most people are consumers of already-created promises, this guide will explain consumption of returned promises before explaining how to create them....uses createAudioFileAsync() : js function successCallback(result)...your callbacks to it instead: js createAudioFileAsync(audioSettings)...

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  3. instanceof - JavaScript | MDN

    The instanceof operator tests to see if the prototype property of a constructor appears anywhere in the prototype chain of an object. The return value is a boolean value. Its behavior can be customized with Symbol.hasInstance.... Try it Syntax js object instanceof constructor...constructed with constructor . js // defining constructors function...

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  4. Rest parameters - JavaScript | MDN

    The rest parameter syntax allows a function to accept an indefinite number of arguments as an array, providing a way to represent variadic functions in JavaScript.... Try it Syntax js function f(a, b, ...theArgs)...placed within an Array object. js function myFun(a, b, ...manyMoreArgs)...

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  5. SyntaxError: invalid assignment left-hand side ...

    The JavaScript exception "invalid assignment left-hand side" occurs when there was an unexpected assignment somewhere. It may be triggered when a single = sign was used instead of == or ===....Examples Typical invalid assignments js if (Math.PI + 1 = 3 || Math.PI...plus ( + ) operator is needed. js if (Math.PI + 1 === 3 || Math...

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  6. function* - JavaScript | MDN

    The function* declaration creates a binding of a new generator function to a given name. A generator function can be exited and later re-entered, with its context (variable bindings) saved across re-entrances.... Try it Syntax js function* name(param0) { statements...contexts. Examples Basic example js function* idMaker() { let index...

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  7. Text formatting - JavaScript | MDN

    This chapter introduces how to work with strings and text in JavaScript....either single or double quotes: js 'foo' "bar" More advanced strings...interpreted as a hexadecimal number. js "\xA9" // "©" Unicode escape...

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  8. super - JavaScript | MDN

    The super keyword is used to access properties on an object literal or class's [[Prototype]], or invoke a superclass's constructor.... Try it Syntax js super() super(arg1) super(arg1...super itself is a SyntaxError . js const child = { myParent() {...

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  9. SyntaxError: unparenthesized unary expression c...

    The JavaScript exception "unparenthesized unary expression can't appear on the left-hand side of '**'" occurs when a unary operator (one of typeof, void, delete, await, !, ~, +, -) is used on the left operand of the exponentiation operator without parentheses....likely wrote something like this: js -a ** b Whether it should be...side to resolve the ambiguity. js (-a) ** b -(a ** b) Other unary...

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  10. Exponentiation (**) - JavaScript | MDN

    The exponentiation (**) operator returns the result of raising the first operand to the power of the second operand. It is equivalent to Math.pow(), except it also accepts BigInts as operands.... Try it Syntax js x ** y Description The ** operator...Exponentiation using numbers js 2 ** 3; // 8 3 ** 2; // 9 3 **...

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