has

Check if map has a key.

Similar: has, hasValue, hasEntry, hasSubset, hasPath.
Similar: randomKey, keys, has.

function has(x, k)
// x: a map
// k: search key

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

var x = new Map([['a', 1], ['b', 2], ['c', -3]]);
map.has(x, 'd');
// → false

map.has(x, 'c');
// → true

References

• Array.prototype.includes: MDN web docs
• array-tools.contains: @75lb