concat

Appends entries from maps, preferring last. 📦 😺 🏃 📼 🌔 📜 📰 📘

Alternatives: concat, concat$.

map.concat(...xs);
// xs: maps

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

var x = new Map([["a", 1], ["b", 2]]);
var y = new Map([["c", 3], ["d", 4]]);
map.concat(x, y);
// Map(4) { "a" => 1, "b" => 2, "c" => 3, "d" => 4 }

var z = new Map([["d", 40], ["e", 50]]);
map.concat(x, y, z);
// Map(5) { "a" => 1, "b" => 2, "c" => 3, "d" => 40, "e" => 50 }

References

• Array.prototype.concat: MDN web docs
• Array.add: sugarjs