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dstreet/flatten-array.js

Created October 18, 2017 17:54
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Flatten a JS array
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flatten-array.js
const assert = require('assert')
const flatten = arr => arr.reduce((acc, el) => {
return acc.concat(Array.isArray(el) ? flatten(el) : el)
}, [])
assert.deepEqual(flatten([1, 2, 3, 4]), [1, 2, 3, 4])
assert.deepEqual(flatten([1, [2, 3], 4]), [1, 2, 3, 4])
assert.deepEqual(flatten([1, [2, [3]], 4]), [1, 2, 3, 4])
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