compare

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

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

var y = new Map([['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

• String.prototype.localeCompare: MDN web docs
• string::compare: cplusplus
• String.Compare: .NET