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Obtain all possible prefixes.
Alternatives: iprefixes, prefixes. Similar: randomPrefix, prefixes, hasPrefix.
function prefixes(x, n) // x: an array // n: number of values [-1 ⇒ any]
const xarray = require('extra-array'); xarray.prefixes([1, 2]); // → [ [], [ 1 ], [ 1, 2 ] ] xarray.prefixes([1, 2, 3]); // → [ [], [ 1 ], [ 1, 2 ], [ 1, 2, 3 ] ]