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Append values from arrays.
Alternatives: concat, concat$. Similar: concat, join.
function concat(...xs) // xs: arrays
const xarray = require('extra-array'); var x = [1, 2]; var y = [3, 4]; xarray.concat(x, y); // → [ 1, 2, 3, 4 ] xarray.concat(x, y, y); // → [ 1, 2, 3, 4, 3, 4 ]