About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

graphemeClusters2iterator

Create an iterator which iterates over grapheme clusters.

Installation

npm install @stdlib/string-to-grapheme-cluster-iterator

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var graphemeClusters2iterator = require( '@stdlib/string-to-grapheme-cluster-iterator' );

graphemeClusters2iterator( src[, mapFcn[, thisArg]] )

Returns an iterator which iterates over each grapheme cluster in a string.

var iter = graphemeClusters2iterator( '🌷🍕' );

var v = iter.next().value;
// returns '🌷'

v = iter.next().value;
// returns '🍕'

var bool = iter.next().done;
// returns true

The returned iterator protocol-compliant object has the following properties:

• next: function which returns an iterator protocol-compliant object containing the next iterated value (if one exists) assigned to a value property and a done property having a boolean value indicating whether the iterator is finished.
• return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.

To invoke a function for each src value, provide a callback function.

function fcn( v ) {
    return v + v;
}

var it = graphemeClusters2iterator( 'beep', fcn );
// returns <Object>

var v = it.next().value;
// returns 'bb'

v = it.next().value;
// returns 'ee'

v = it.next().value;
// returns 'ee'

// ...

The invoked function is provided three arguments:

• value: grapheme cluster.
• index: iterated value index.
• src: source string.

function fcn( v, i ) {
    return v + i;
}

var it = graphemeClusters2iterator( 'bar', fcn );
// returns <Object>

var v = it.next().value;
// returns 'b0'

v = it.next().value;
// returns 'a1'

v = it.next().value;
// returns 'r2'

// ...

To set the callback function execution context, provide a thisArg.

function fcn( v ) {
    this.count += 1;
    return v;
}

var ctx = {
    'count': 0
};

var it = graphemeClusters2iterator( '🌷🍕', fcn, ctx );
// returns <Object>

var v = it.next().value;
// returns '🌷'

v = it.next().value;
// returns '🍕'

var count = ctx.count;
// returns 2

Notes

• If an environment supports Symbol.iterator, the returned iterator is iterable.
• In environments supporting Symbol.iterator, the function explicitly does not invoke a string's @@iterator method, regardless of whether this method is defined. To convert a string to an implementation defined iterator, invoke this method directly.

Examples

var graphemeClusters2iterator = require( '@stdlib/string-to-grapheme-cluster-iterator' );

function repeat( str ) {
    return str + str;
}

// Create an iterator which iterates over grapheme clusters:
var it = graphemeClusters2iterator( 'Iñtërnâtiônàlizætiøn', repeat );

// Perform manual iteration...
var v;
while ( true ) {
    v = it.next();
    if ( v.done ) {
        break;
    }
    console.log( v.value );
}

---

See Also

• @stdlib/array-to-iterator: create an iterator from an array-like object.
• @stdlib/string-to-grapheme-cluster-iterator-right: create an iterator which iterates from right to left over grapheme clusters.

---

Notice

This package is part of 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, see the main project repository.

Community

---

Copyright

Copyright © 2016-2024. The Stdlib Authors.