array.prototype.flat

An ES2019 spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.
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Array.prototype.flattenArray.prototype.flatflattenflatarrayESnextshimpolyfillflatMapArray.prototype.flatMapes-shim API

es-iterator-helpers

An ESnext spec-compliant iterator helpers shim/polyfill/replacement that works as far down as ES3.
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javascriptecmascriptpolyfillshimes-shimses-shim APIIteratorhelpersfrommapfiltertakedropflatMapreducetoArrayforEachsomeeveryfind

array.prototype.flatmap

An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.
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Array.prototype.flatMapflatMaparrayESnextshimpolyfillflattenArray.prototype.flattenes-shim API

array-flat-polyfill

A polyfill for Array.prototype.flat and Array.prototype.flatMap
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javascriptjsflatflatMapconcatflatten

axax

A library of async iterator extensions for JavaScript including ```map```, ```reduce```, ```filter```, ```flatMap```, ```pipe``` and [more](https://github.com/jamiemccrindle/axax/blob/master/docs/API.md#functions).
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asyncasync iteratorsasync generatorsflatMapmapmergefiltermapreduce