compare - nodef/extra-map GitHub Wiki

Compare two maps.

Similar: compare, isEqual.

function compare(x, y, fc, fm)
// x:  a map
// y:  another map
// fc: compare function (a, b)
// fm: map function (v, k, x)

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

var x = new Map(['a', 1], ['b', 2](/nodef/extra-map/wiki/'a',-1],-['b',-2));
var y = new Map(['a', 1], ['b', 2], ['c', 3](/nodef/extra-map/wiki/'a',-1],-['b',-2],-['c',-3));
map.compare(x, y);
// → -1

var y = new Map(['a', 1], ['b', 2](/nodef/extra-map/wiki/'a',-1],-['b',-2));
map.compare(x, y);
// → 0

var y = new Map(['a', 1], ['b', -2](/nodef/extra-map/wiki/'a',-1],-['b',--2));
map.compare(x, y);
// → 1

map.compare(x, y, (a, b) => Math.abs(a) - Math.abs(b));
// → 0

map.compare(x, y, null, v => Math.abs(v));
// → 0

References