take$

Keep first n entries only (default order).

Alternatives: take, take$.
Similar: take, drop.

function take$(x, n)
// x: a map (updated)
// n: number of entries [1]

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

var x = new Map([['a', 1], ['b', 2], ['c', 3], ['d', 4]]);
map.take$(x, 2);
// → Map(2) { 'a' => 1, 'b' => 2 }

x;
// → Map(2) { 'a' => 1, 'b' => 2 }

var x = new Map([['a', 1], ['b', 2], ['c', 3], ['d', 4]]);
map.take$(x, 3);
// → Map(3) { 'a' => 1, 'b' => 2, 'c' => 3 }

References

• Data.List.take: Haskell
• Array.prototype.slice: MDN web docs
• _.take: lodash
• Array.to: sugarjs