String startsWith() and endsWith() | Frontend Practical Guide

Overview

The startsWith() and endsWith() methods of strings returns whether a search string appears at the beginning or end of the provided string.

Feature	Desktop				Mobile
Feature	Chrome	Edge	Firefox	Safari	Chrome Android	Safari iOS
`javascript.builtins.String.endsWith`	41	12	17	9	36	9
Built-in object
`String.startsWith` The startsWith() method of String values determines whether this string begins with the characters of a specified string, returning true or false as appropriate.	41	12	17	9	36	9

1+Supported (version) Not supported ※Has note Sub-feature descriptions sourced from MDN Web Docs (CC BY-SA 2.5)

JAVASCRIPT

const filename = 'document.pdf';

filename.startsWith('doc');  // true
filename.endsWith('.pdf');   // true
filename.endsWith('.txt');   // false

EndsWith Use, filename that specific. extendedchild in end or inspect it..

start or inspect it.. with StartsWith Use, URL that https://.

ID etc. String that specific. prefix in start or check..

Using String startsWith() and endsWith()
The startsWith() and endsWith() methods of strings returns whether a search string appears at the beginning or end of the provided string.