swap$

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Subhajit Sahu edited this page Feb 3, 2021 · 15 revisions

Exchanges two values. 🏃 📼 📦 🌔 📒

Alternatives: swap, swap$.

map.swap$(x, k, l);
// x: a map (updated)
// k: a key
// l: another key
// --> x

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

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

x;
// Map(4) { "a" => 2, "b" => 1, "c" => 3, "d" => 4 }

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

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