Practical ES6

Chapter 4: New String Methods — String.prototype.*

by Aurelio de Rosa

In my previous chapter on ES6 array methods, I introduced the new methods available in ECMAScript 6 that work with the Array type. In this tutorial, you'll learn about new ES6 methods that work with strings: String.prototype.*

We'll develop several examples, and mention the polyfills available for them. Remember that if you want to polyfill them all using a single library, you can employ es6-shim by Paul Miller.

String.prototype.startsWith()

One of the most-used functions in every modern programming language is the one to verify if a string starts with a given substring. Before ES6, JavaScript had no such function, meaning you had to write it yourself. The following code shows ...