hasSubset - nodef/extra-map GitHub Wiki
Check if map has a subset.
Alternatives: has, hasValue, hasEntry, hasSubset, hasPath. Similar: randomSubset, subsets, hasSubset.
function hasSubset(x, y, fc, fm)
// x: a map
// y: search subset
// fc: compare function (a, b)
// fm: map function (v, k, x)
const map = require('extra-map');
var x = new Map(['a', 1], ['b', 2], ['c', 3], ['d', 4](/nodef/extra-map/wiki/'a',-1],-['b',-2],-['c',-3],-['d',-4));
var y = new Map(['b', 2], ['d', 4](/nodef/extra-map/wiki/'b',-2],-['d',-4));
map.hasSubset(x, y);
// → true
var y = new Map(['b', -2], ['d', -4](/nodef/extra-map/wiki/'b',--2],-['d',--4));
map.hasSubset(x, y);
// → false
map.hasSubset(x, y, (a, b) => Math.abs(a) - Math.abs(b));
// → true
map.hasSubset(x, y, null, v => Math.abs(v));
// → true