isEmpty

Check if a map is empty.

Similar: size, isEmpty.

function isEmpty(x)
// x: a map

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

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

var x = new Map();
map.isEmpty(x);
// → true

References

• Data.List.null: Haskell
• List.isEmpty: elm
• Array.length: MDN web docs
• Array.isEmpty: sugarjs