The explicit versioning and opt-in of language features was Mozilla-specific and are in process of being removed. Firefox 4 was the last version which referred to a JavaScript version (1.8.5). With new ECMA standards, JavaScript language features are now often mentioned with their initial defin...
ECMAScriptis the standardization of the family of scripting languages that includes JavaScript. New versions of the standard are released every year. It is standardized by Ecma International. ECMAScript is commonly used for client-side scripting on the World Wide Web, and it is increasingly being ...
Old ECMAScript versions was named by numbers: ES5 and ES6. From 2016, versions are named by year: ES2016, 2018, 2020 ... The 15th edition, ECMAScript 2024, is published in July 2024. New Features in ES2024 Object.groupBy() Map.groupBy() ...
ECMAScript 8, also known as ES8 or ECMAScript 2017, is a version of ECMAScript that brought numerous features and improvements to the JavaScript language. Whether you’re a seasoned developer or just starting out with popular JavaScript libraries like React, understanding ES8 is vital to keeping ...
Non ECMAScript standard features pwfree-es5-extprovides also other utils, and implements them as if they were proposed for a standard. It mostly offers methods (not functions) which can directly be assigned to native prototypes: Object.defineProperty(Function.prototype,"partial",{value:require("pw...
Promise.allSettled()hasgood supportand is polyfillable with libraries like core-js (only applicable tonewer versions). String.matchAll() Another new improvement-like method is[String.matchAll()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/matchAll). Bas...
Strict Mode is a way to cause the runtime engine to interpret and execute JavaScript with different semantics than what you’d see with unrestricted code. Code running in strict mode has the following characteristics:Excludes some syntactic and semantic features;you can’t do some things that ...
If you are wondering what stages various proposed features are in, consultthe readme of the ECMA-262 GitHub repository. Is there an official list of ECMAScript features?# Yes, the TC39 repo listsfinished proposalsand mentions in which ECMAScript versions they are introduced. ...
There are numerical differences between each of the JavaScript versions and the corresponding ECMAScript editions. This is to say that JavaScript is compatible with the ECMAScript standard, while providing more features. The table below summarizes the relationship between JavaScript and ECMAScript: ...
everyday JavaScript coding. Please note that support for these new ECMAScript 6 features is well underway in modern browsers, although support varies. If you need to support old versions of browsers that lack many ES6 features, I’ll touch on solutions that might help you start using ES6 ...