String.prototype.toLowerCase()
The toLowerCase() method returns the calling string value converted to lower case.
Syntax
JavaScript
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<var>str</var>.toLowerCase()
Return value
A new string representing the calling string converted to lower case.
Description
The toLowerCase() method returns the value of the string converted to lower case. toLowerCase() does not affect the value of the string str itself.
Examples
Using toLowerCase()
JavaScript
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console.log('ALPHABET'.toLowerCase()); // 'alphabet'
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0. |
| ECMAScript 5.1 (ECMA-262) The definition of 'String.prototype.toLowerCase' in that specification. |
Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'String.prototype.toLowerCase' in that specification. |
Standard | |
| ECMAScript 2017 Draft (ECMA-262) The definition of 'String.prototype.toLowerCase' in that specification. |
Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
See also
String.prototype.toLocaleLowerCase()String.prototype.toLocaleUpperCase()String.prototype.toUpperCase()
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/string/tolowercase