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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. 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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  3. 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(...

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  4. Code unit - MDN Web Docs Glossary: Definitions ...

    A code unit is the basic component used by a character encoding system (such as UTF-8 or UTF-16). A character encoding system uses one or more code units to encode a Unicode code point....using two Unicode code points: js const myString = "\u006E\u0303";...is called a surrogate pair : js const face = "🥵"; console.log(face...

    developer.mozilla.org/en-US/docs/Glossary/Code_...
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  5. 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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  6. Testing media queries programmatically - CSS: C...

    The DOM provides features that can test the results of a media query programmatically, via the MediaQueryList interface and its methods and properties. Once you've created a MediaQueryList object, you can check the result of the query or receive notifications when the result changes....landscape or portrait orientation : js const mediaQueryList = window...value of its matches property: js if (mediaQueryList.matches) {...

    developer.mozilla.org/en-US/docs/Web/CSS/CSS_me...
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  7. Document Viewer 2.0.0 with Image Mode, Page nav...

    Today, we are pleased to announce another release of ASP.NET WebForms Modern UI Document Viewer 2.0.0 using GroupDocs.Viewer for .NET version 17.11.0. This release v2.0.0 comes up with new features and improvements to view document in both HTML and Image representations for different document formats like DOCX, PDF, XLSX, PPTX, MSG with attachments and allow user to Zoom, Navigate to Pages, set Watermark and tools/features configuration options through Js Parameters and many more features....configuration options through JS Parameters and many more features...Show/Hide & Configure Tools from JS Parameters # User can now show...

    blog.groupdocs.com/viewer/asp.net-webforms-mode...
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  8. 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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  9. Window: languagechange event - Web APIs | MDN

    Learn about the languagechange event, including its type and syntax, code examples, specifications, and browser compatibility.... js addEventListener("languagechange"...in an addEventListener method: js window.addEventListener("languagechange"...

    developer.mozilla.org/en-US/docs/Web/API/Window...
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  10. 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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