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Lists all possible prefixes.
array.prefixes(x); // x: an array // --> ...prefixes
const array = require('extra-array'); [...array.prefixes([1, 2])]; // [ [ 1, 2 ], [ 2 ] ] [...array.prefixes([1, 2, 3])]; // [ [ 1, 2, 3 ], [ 2, 3 ], [ 3 ] ]