difference$ - nodef/extra-map GitHub Wiki
Obtain entries not present in another map.
Alternatives: difference, difference$. Similar: union, intersection, difference, symmetricDifference, isDisjoint.
function difference$(x, y)
// x: a map (updated)
// y: another map
const map = require('extra-map');
var x = new Map(['a', 1], ['b', 2], ['c', 3], ['d', 4], ['e', 5](/nodef/extra-map/wiki/'a',-1],-['b',-2],-['c',-3],-['d',-4],-['e',-5));
var y = new Map(['b', 2], ['d', 4](/nodef/extra-map/wiki/'b',-2],-['d',-4));
map.difference$(x, y);
// → Map(3) { 'a' => 1, 'c' => 3, 'e' => 5 }
x;
// → Map(3) { 'a' => 1, 'c' => 3, 'e' => 5 }
var x = new Map(['a', 1], ['b', 2], ['c', 3], ['d', 4], ['e', 5](/nodef/extra-map/wiki/'a',-1],--['b',-2],-['c',-3],-['d',-4],-['e',-5));
var y = new Map(['b', -2], ['d', -4](/nodef/extra-map/wiki/'b',--2],-['d',--4));
map.difference$(x, y);
// → Map(3) { 'a' => 1, 'c' => 3, 'e' => 5 }