concat$ - nodef/extra-array GitHub Wiki
Append values from arrays!
function concat$(x, ...ys)
// x: an array (updated!)
// ys: arrays to append
const xarray = require('extra-array');
var x = [1, 2];
var y = [3, 4];
xarray.concat$(x, y);
// → [ 1, 2, 3, 4 ]
x;
// → [ 1, 2, 3, 4 ]
var x = [1, 2];
xarray.concat$(x, y, y);
// → [ 1, 2, 3, 4, 3, 4 ]