union

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Subhajit Sahu edited this page Jun 17, 2020 · 15 revisions

Gives entries present in any entries. 🏃 📼 📦 🌔 📒

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

entries.union(x, y, [fn]);
// x:  entries
// y:  another entries
// fn: combine function (a, b)

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

var x = [['a', 1], ['b', 2], ['c', 3]];
var y = [['b', 20], ['c', 30], ['d', 40]];
[...entries.union(x, y)];
// [ [ 'a', 1 ], [ 'b', 2 ], [ 'c', 3 ], [ 'd', 40 ] ]

[...entries.union(x, y, (a, b) => b)];
// [ [ 'a', 1 ], [ 'b', 20 ], [ 'c', 30 ], [ 'd', 40 ] ]

references