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https://github.com/stdlib-js/iter-push

Create an iterator which appends additional values to the end of a provided iterator.
https://github.com/stdlib-js/iter-push

append augment concat concatenate extend iterable iterate iterator javascript node node-js nodejs push stdlib util utilities utility utils

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Create an iterator which appends additional values to the end of a provided iterator.

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README 

        



  

    About stdlib...

  

  
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# iterPush



[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] 



> Create an [iterator][mdn-iterator-protocol] which appends additional values to the end of a provided [iterator][mdn-iterator-protocol].



## Installation



```bash

npm install @stdlib/iter-push

```



Alternatively,



-   To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).

-   If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).

-   For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).



The [branches.md][branches-url] 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



```javascript

var iterPush = require( '@stdlib/iter-push' );

```



#### iterPush( iterator, ...items )



Returns an [iterator][mdn-iterator-protocol] which appends additional values to the **end** of a provided [`iterator`][mdn-iterator-protocol].



```javascript

var array2iterator = require( '@stdlib/array-to-iterator' );



var it = iterPush( array2iterator( [ 1, 2 ] ), 3, 4 );

// returns 



var v = it.next().value;

// returns 1



v = it.next().value;

// returns 2



v = it.next().value;

// returns 3



v = it.next().value;

// returns 4



var bool = it.next().done;

// returns true

```



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



-   **next**: function which returns an [iterator][mdn-iterator-protocol] 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][mdn-iterator-protocol] is finished.

-   **return**: function which closes an [iterator][mdn-iterator-protocol] and returns a single (optional) argument in an [iterator][mdn-iterator-protocol] protocol-compliant object.



## Notes



-   If an environment supports `Symbol.iterator` **and** a provided [iterator][mdn-iterator-protocol] is iterable, the returned [iterator][mdn-iterator-protocol] is iterable.



## Examples



```javascript

var randu = require( '@stdlib/random-iter-randu' );

var iterPush = require( '@stdlib/iter-push' );



// Create a seeded iterator for generating pseudorandom numbers:

var rand = randu({

    'seed': 1234,

    'iter': 10

});



// Create an iterator with appended values:

var it = iterPush( rand, 'beep', 'boop' );



// Perform manual iteration...

var v;

while ( true ) {

    v = it.next();

    if ( v.done ) {

        break;

    }

    console.log( v.value );

}

```



* * *



## See Also



-   [`@stdlib/iter-concat`][@stdlib/iter/concat]: create an iterator which iterates over the values of two or more iterators.

-   [`@stdlib/iter-unshift`][@stdlib/iter/unshift]: create an iterator which prepends values to the beginning of a provided iterator.



* * *



## Notice



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].



#### Community



[![Chat][chat-image]][chat-url]



---



## License



See [LICENSE][stdlib-license].



## Copyright



Copyright © 2016-2024. The Stdlib [Authors][stdlib-authors].



[npm-image]: http://img.shields.io/npm/v/@stdlib/iter-push.svg

[npm-url]: https://npmjs.org/package/@stdlib/iter-push



[test-image]: https://github.com/stdlib-js/iter-push/actions/workflows/test.yml/badge.svg?branch=main

[test-url]: https://github.com/stdlib-js/iter-push/actions/workflows/test.yml?query=branch:main



[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/iter-push/main.svg

[coverage-url]: https://codecov.io/github/stdlib-js/iter-push?branch=main



[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg

[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im



[stdlib]: https://github.com/stdlib-js/stdlib



[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors



[umd]: https://github.com/umdjs/umd

[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules



[deno-url]: https://github.com/stdlib-js/iter-push/tree/deno

[deno-readme]: https://github.com/stdlib-js/iter-push/blob/deno/README.md

[umd-url]: https://github.com/stdlib-js/iter-push/tree/umd

[umd-readme]: https://github.com/stdlib-js/iter-push/blob/umd/README.md

[esm-url]: https://github.com/stdlib-js/iter-push/tree/esm

[esm-readme]: https://github.com/stdlib-js/iter-push/blob/esm/README.md

[branches-url]: https://github.com/stdlib-js/iter-push/blob/main/branches.md



[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/iter-push/main/LICENSE



[mdn-iterator-protocol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol



[@stdlib/iter/concat]: https://github.com/stdlib-js/iter-concat



[@stdlib/iter/unshift]: https://github.com/stdlib-js/iter-unshift