prefixes - nodef/extra-array GitHub Wiki
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 ] ]