filterAt - nodef/extra-lists GitHub Wiki

Keep entries with given keys.

Similar: map, reduce, filter, filterAt, reject, rejectAt.

function filterAt(x, ks)
// x:  lists
// ks: keys
const xlists = require('extra-lists');

var x = ['a', 'b', 'c', 'd', 'e'], [1, 2, 3, 4, 5](/nodef/extra-lists/wiki/'a',-'b',-'c',-'d',-'e'],-[1,-2,-3,-4,-5);
xlists.filterAt(x, ['a', 'c', 'e']);
// → [ [ 'a', 'c', 'e' ], [ 1, 3, 5 ] ]

xlists.filterAt(x, ['b', 'd']);
// → [ [ 'b', 'd' ], [ 2, 4 ] ]

References