Array.prototype.flatten returns a new array with all sub-array elements concatted into it recursively up to the specified depth.
Array.prototype.flatMap first maps each element using a mapping function, then flattens the result into a new array. It is identical to a map followed by a flatten of depth 1, but flatMap is quite often useful and merging both into one method is slightly more efficient.
flatMap method is called with one or two arguments, the following steps are taken:
flatten method is called with zero or one arguments, the following steps are taken:
© 2018 Michael Ficarra and Brian Terlson
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