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Deep flattens an array.
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| const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v))); | |
| // deepFlatten([1, [2], [[3], 4], 5]); // [1,2,3,4,5] |
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| const isUndefined = val => val === undefined; | |
| // isUndefined(undefined); // true |
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