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Cauterite/generating-arrays.js

Created January 8, 2017 00:15
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generating-arrays.js
Array(5)
-> [<5 empty slots>]
[...Array(5)]
-> [undefined, undefined, undefined, undefined, undefined]
[...Array(5)].map((_, X) => X)
-> [0, 1, 2, 3, 4]
[...Array(5).keys()]
-> [0, 1, 2, 3, 4]
Object.keys([...Array(5)])
-> ["0", "1", "2", "3", "4"]
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