@extra-map/filter-at

Gets map with given keys. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

Usage no npm install needed!

<script type="module">
  import extraMapFilterAt from 'https://cdn.skypack.dev/@extra-map/filter-at';
</script>

README

Gets map with given keys. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

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

This is part of package extra-map.


map.filterAt(x, ks);
// x:  a map
// ks: keys

const map = require("extra-map");

var x = new Map([["a", 1], ["b", 2], ["c", 3], ["d", 4], ["e", 5]]);
map.filterAt(x, ["a", "c", "e"]);
// Map(3) { "a" => 1, "c" => 3, "e" => 5 }

map.filterAt(x, ["b", "d"]);
// Map(2) { "b" => 2, "d" => 4 }


References