intersection

Gives entries present in both maps. 📦 😺 🏃 📼 🌔 📜 📰 📘

Alternatives: intersection, intersection$.
Similar: union, intersection, difference, symmetricDifference, isDisjoint.

map.intersection(x, y, [fc]);
// x:  a map
// y:  another map
// fc: combine function (a, b)

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

var x = new Map([["a", 1], ["b", 2], ["c", 3], ["d", 4]]);
var y = new Map([["b", 20], ["c", 30], ["e", 50]]);
map.intersection(x, y);
// Map(2) { "b" => 2, "c" => 3 }

map.intersection(x, y, (a, b) => b);
// Map(2) { "b" => 20, "c" => 30 }

References

• Data.Set.intersection: Haskell
• Set.intersection: Python
• _.intersection: lodash
• _.intersectionBy: lodash
• _.intersectionWith: lodash
• Array.intersect: sugarjs