concat - nodef/extra-lists GitHub Wiki

Append entries from all lists, preferring last.

function concat(...xs)
// xs: all lists

const xlists = require('extra-lists');

var x = ['a', 'b'], [1, 2](/nodef/extra-lists/wiki/'a',-'b'],-[1,-2);
var y = ['c', 'd'], [3, 4](/nodef/extra-lists/wiki/'c',-'d'],-[3,-4);
xlists.concat(x, y).map(c => [...c]);
// → [ [ 'a', 'b', 'c', 'd' ], [ 1, 2, 3, 4 ] ]

var z = ['d', 'e'], [40, 50](/nodef/extra-lists/wiki/'d',-'e'],-[40,-50);
// → [ [ 'a', 'b', 'c', 'd', 'd', 'e' ], [ 1, 2, 3, 4, 40, 50 ] ]

References