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    es-get-iterator
    DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/es-get-iterator package

    1.1.2 • Public • Published

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    Get an iterator for any JS language value. Works robustly across all environments, all versions.

    In modern engines, value[Symbol.iterator]() is sufficient to produce an iterator (an object with a .next method) for that object. However, older engines:

    • may lack Symbol support altogether
    • may have Symbol.iterator but not implement it on everything it should, like arguments objects
    • may have Map and Set, but a non-standard name for the iterator-producing method (.iterator or ['@@iterator'], eg)
    • may be old versions of Firefox that produce values until they throw a StopIteration exception, rather than having iteration result objects
    • may be polyfilled/shimmed/shammed, with es6-shim or core-js or similar

    This library attempts to provide an abstraction over all that complexity!

    In node v13+, exports is used to provide a lean implementation that lacks all the complexity described above, in combination with the browser field so that bundlers will pick up the proper implementation.

    Targeting browsers with Symbol support

    If you are targeting browsers that definitely all have Symbol support, then you can configure your bundler to replace require('has-symbols')() with a literal true, which should allow dead code elimination to reduce the size of the bundled code.

    With @rollup/plugin-replace

    // rollup.config.js
    
    import replace from '@rollup/plugin-replace';
    
    export default {
    	...
    	plugins: [
    		replace({
    			"require('has-symbols')()": 'true',
    			delimiters: ['', '']
    		})
    	]
    };

    Example

    var getIterator = require('es-get-iterator');
    var assert = require('assert');
    
    var iterator = getIterator('a 💩');
    assert.deepEqual(
    	[iterator.next(), iterator.next(), iterator.next(), iterator.next()],
    	[{ done: false, value: 'a' }, { done: false, value: ' ' }, { done: false, value: '💩' }, { done: true, value: undefined }]
    );
    
    var iterator = getIterator([1, 2]);
    assert.deepEqual(
    	[iterator.next(), iterator.next(), iterator.next()],
    	[{ done: false, value: 1 }, { done: false, value: 2 }, { done: true, value: undefined }]
    );
    
    var iterator = getIterator(new Set([1, 2]));
    assert.deepEqual(
    	[iterator.next(), iterator.next(), iterator.next()],
    	[{ done: false, value: 1 }, { done: false, value: 2 }, { done: true, value: undefined }]
    );
    
    var iterator = getIterator(new Map([[1, 2], [3, 4]]));
    assert.deepEqual(
    	[iterator.next(), iterator.next(), iterator.next()],
    	[{ done: false, value: [1, 2] }, { done: false, value: [3, 4] }, { done: true, value: undefined }]
    );

    Tests

    Simply clone the repo, npm install, and run npm test

    Install

    npm i es-get-iterator

    DownloadsWeekly Downloads

    7,432,873

    Version

    1.1.2

    License

    MIT

    Unpacked Size

    28.5 kB

    Total Files

    16

    Last publish

    Collaborators

    • ljharb