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  1. try...catch - JavaScript | MDN

    The try...catch statement is comprised of a try block and either a catch block, a finally block, or both. The code in the try block is executed first, and if it throws an exception, the code in the catch block will be executed. The code in the finally block will always be executed before control flow exits the entire construct.... Try it Syntax js try { tryStatements } catch (exceptionVar)...instead of single statements. js try doSomething(); // SyntaxError...

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  2. Greater than or equal (>=) - JavaScript | MDN

    The greater than or equal (>=) operator returns true if the left operand is greater than or equal to the right operand, and false otherwise.... Try it Syntax js x >= y Description The operands...Examples String to string comparison js "a" >= "b"; // false "a" >= "a";...

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  3. SyntaxError: arguments is not valid in fields -...

    The JavaScript exception "SyntaxError: arguments is not valid in fields" occurs when the arguments identifier is read in a class field initializer or in a static initialization block, outside of a non-arrow function.... Examples js function makeOne() { class C...in fields } return new C(); } js let CArgs; class C { static {...

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  4. URIError: malformed URI sequence - JavaScript |...

    The JavaScript exception "malformed URI sequence" occurs when URI encoding or decoding wasn't successful....a high-low pair, for example: js encodeURI("\uD800"); // "URIError:...high-low pair is OK. For example: js encodeURI("\uD800\uDFFF"); //...

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  5. decodeURIComponent() - JavaScript | MDN

    The decodeURIComponent() function decodes a Uniform Resource Identifier (URI) component previously created by encodeURIComponent() or by a similar routine.... Try it Syntax js decodeURIComponent(encodedURI)...Decoding a Cyrillic URL component js decodeURIComponent("JavaScri...

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  6. Functions - JavaScript | MDN

    Functions are one of the fundamental building blocks in JavaScript. A function in JavaScript is similar to a procedure—a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some input and return an output where there is some obvious relationship between the input and the output. To use a function, you must define it somewhere in the scope from which you wish to call it....defines a function named square : js function square(number) { return...shown in the following example: js function myFunc(theObject) {...

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  7. JavaScript modules - JavaScript | MDN

    This guide gives you all you need to get started with JavaScript module syntax....js , for example). Complex projects...be imported when needed. Node.js has had this ability for a long...

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  8. SyntaxError: "x" is a reserved identifier - Jav...

    The JavaScript exception "variable is a reserved identifier" occurs when reserved keywords are used as identifiers.... js const enum = { RED: 0, GREEN:...more identifiers are reserved. js "use strict"; const package =...

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  9. Functions — reusable blocks of code - Learn web...

    Another essential concept in coding is functions, which allow you to store a piece of code that does a single task inside a defined block, and then call that code whenever you need it using a single short command — rather than having to type out the same code multiple times. In this article we'll explore fundamental concepts behind functions such as basic syntax, how to invoke and define them, scope, and parameters....manipulated a text string, for example: js const myText = "I am a string";...time we manipulated an array: js const myArray = ["I", "love"...

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  10. URLSearchParams - Web APIs | MDN

    Learn about the URLSearchParams interface, including its constructor, properties, and methods, code examples, specifications, and browser compatibility....following two lines are equivalent: js for (const [key, value] of mySearchParams)...contained in this object. Examples js const paramsString = "q=URLUtils...

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