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  1. delete - JavaScript | MDN

    The delete operator removes a property from an object. If the property's value is an object and there are no more references to the object, the object held by that property is eventually released automatically.... Try it Syntax js delete object.property delete...syntax errors in strict mode : js delete identifier; delete object...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  2. TypeError: "x" is (not) "y" - JavaScript | MDN

    The JavaScript exception "x is (not) y" occurs when there was an unexpected type. Oftentimes, unexpected undefined or null values.... js const foo = undefined; foo.substring(1);...might require a specific type. js const foo = {}; Symbol.keyFor(foo);...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  3. hochan222 (hochan Lee) · GitHub

    "Done is better than perfect". hochan222 has 112 repositories available. Follow their code on GitHub....Conference 1 Day 1 Medium Mail JS Piscine solved.ac github stats...42js/ you-dont-know-js-yet 42js/you-dont-know-js-yet Public You Don't...

    github.com/hochan222
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  4. parseInt() - JavaScript | MDN

    The parseInt() function parses a string argument and returns an integer of the specified radix (the base in mathematical numeral systems).... Try it Syntax js parseInt(string) parseInt(string...following examples all return 15 : js parseInt("0xF", 16); parseInt("F"...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  5. ContentIndex - Web APIs | MDN

    Learn about the ContentIndex interface, including its properties and methods, code examples, specifications, and browser compatibility.... js // reference registration const...register it with the content index . js // our content const item = {...

    developer.mozilla.org/en-US/docs/Web/API/Conten...
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  6. TypeError: can't delete non-configurable array ...

    The JavaScript exception "can't delete non-configurable array element" occurs when it was attempted to shorten the length of an array, but one of the array's elements is non-configurable.... js "use strict"; const arr = [];...intend to shorten the array. js "use strict"; const arr = [];...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  7. decodeURI() - JavaScript | MDN

    The decodeURI() function decodes a Uniform Resource Identifier (URI) previously created by encodeURI() or a similar routine.... Try it Syntax js decodeURI(encodedURI) Parameters...Examples Decoding a Cyrillic URL js decodeURI( "https://developer...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  8. Meta programming - JavaScript | MDN

    The Proxy and Reflect objects allow you to intercept and define custom behavior for fundamental language operations (e.g. property lookup, assignment, enumeration, function invocation, etc.). With the help of these two objects you are able to program at the meta level of JavaScript....getting a property on an object: js const handler = { get(target...proxy leads to a TypeError . js const revocable = Proxy.revocable(...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  9. Array - JavaScript | MDN

    The Array object, as with arrays in other programming languages, enables storing a collection of multiple items under a single variable name, and has members for performing common array operations....the property name is not valid: js arr.0; // a syntax error JavaScript...following example could be true : js console.log(years["2"] !== years["02"]);...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  10. Developer essentials: JavaScript console method...

    The JavaScript console is an essential tool for web development. Learn new and fun ways to use the console to display data and debug your code....— it's logged to the console: js const hello = "Hi there, welcome...correctly used DateTimeFormat : js const currentDate = new Date();...

    developer.mozilla.org/en-US/blog/learn-javascri...
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