4 New JavaScript Features To Watch Out for in 2021

4 New JavaScript Features To Watch Out for in 2021

4 New JavaScript Features To Watch Out for in 2021. We’ll look into four of the most important new features. JavaScript has enjoyed yearly language updates. 2021 is no different: this year, several new features reached Stage 4 of the TC39 Process

Numeric separators, Logical assignment operators, and more

Since 2015, JavaScript has enjoyed yearly language updates. 2021 is no different: this year, several new features reached Stage 4 of the  TC39 Process and are already available in Node.js and most major modern browsers.

In this article, we’ll look into four of the most important new features. We’ll cover a new string method, a new Promise method, improvements to number readability, and a new shorthand for assignments.

replaceAll()

First, we have a new string prototype method, replaceAll, which replaces every instance of a substring. While we could do this with the existing replace method, we had to turn to regular expressions, such as the following:

"1990-01-01".replace(/-/g, "/");

replaceAll is arguably more readable:

"1990-01-01".replaceAll("-", "/");

With replaceAll, no regex is necessary. It can still be used, though, as long as the g flag is provided.

"1990-01-01".replaceAll(/-/g, "/");

Support

Chrome: 85+

Firefox: 77+

Safari: 13.1+

Node: 15.0.0+

javascript programming react nodejs

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