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Pick an arbitrary prefix.
Similar: randomPrefix, prefixes, hasPrefix.
function randomPrefix(x, n, fr) // x: an array // n: number of values [-1 ⇒ any] // fr: random number generator ([0, 1))
const xarray = require('extra-array'); var x = [1, 2, 3]; xarray.randomPrefix(x); // → [ 1, 2 ] xarray.randomPrefix(x, 1); // → [ 1 ] xarray.randomPrefix(x, -1); // → [ 1, 2 ]