String.prototype.trimStart and String.prototype.trimEnd

Published · tagged with ECMAScript ES2019

ES2019 introduces String.prototype.trimStart() and String.prototype.trimEnd():

const string = '  hello world  ';
string.trimStart();
// → 'hello world '
string.trimEnd();
// → ' hello world'
string.trim(); // ES5
// → 'hello world'

This functionality was previously available through the non-standard trimLeft() and trimRight() methods, which remain as aliases of the new methods for backward compatibility.

const string = '  hello world  ';
string.trimStart();
// → 'hello world '
string.trimLeft();
// → 'hello world '
string.trimEnd();
// → ' hello world'
string.trimRight();
// → ' hello world'
string.trim(); // ES5
// → 'hello world'

String.prototype.trim{Start,End} support