Invoke a function for each UTF-16 code unit in a string.
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> Invokes a function for each UTF-16 code unit in a string.
``bash`
npm install @stdlib/string-base-for-each
`javascript`
var forEach = require( '@stdlib/string-base-for-each' );
#### forEach( str, clbk\[, thisArg ] )
Invokes a function for each UTF-16 code unit in a string.
`javascript
function log( value, index ) {
console.log( '%d: %s', index, value );
}
forEach( 'Beep!', log );
/* =>
0: B
1: e
2: e
3: p
4: !
*/
`
The invoked function is provided three arguments:
- value: character.
- index: character index.
- str: input string.
To set the function execution context, provide a thisArg.
`javascript
function clbk() {
this.count += 1;
}
var str = '👉🏿';
var ctx = {
'count': 0
};
forEach( str, clbk, ctx );
var cnt = ctx.count;
// returns 4
`
`javascript
var forEach = require( '@stdlib/string-base-for-each' );
function log( value, index ) {
console.log( '%d: %s', index, value );
}
forEach( 'presidential election', log );
forEach( 'Iñtërnâtiônàlizætiøn', log );
forEach( '🌷🍕', log );
forEach( '\uD834\uDD1E', log );
`
*
- [@stdlib/string-base/for-each-code-point][@stdlib/string/base/for-each-code-point]: invoke a function for each Unicode code point in a string.
- [@stdlib/string-base/for-each-grapheme-cluster][@stdlib/string/base/for-each-grapheme-cluster]: invoke a function for each grapheme cluster (i.e., user-perceived character) in a string.
- [@stdlib/string-for-each][@stdlib/string/for-each]: invoke a function for each character in a string.
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[@stdlib/string/for-each]: https://www.npmjs.com/package/@stdlib/string-for-each