String startsWith() and endsWith()
Widely available since 2018-03-30
The startsWith() and endsWith() methods of strings returns whether a search string appears at the beginning or end of the provided string.
Learning resources on MDN
Browser support
- Chrome 41 Released on 2015-03-03
- Chrome Android 36 Released on 2014-07-16
- Edge 12 Released on 2015-07-29
- Firefox 17 Released on 2012-11-20
- Firefox for Android 17 Released on 2012-11-20
- Safari 9 Released on 2015-09-30
- Safari on iOS 9 Released on 2015-09-16
Specifications
- ECMAScript Language Specification (#sec-string-objects), from TC39 (Ecma International).