partition

Segregates values by test result. 🏃 📼 📦 🌔 📒

Alternatives: partition, partitionAs.

entries.partition(x, fn);
// x:  entries
// fn: test function (v, k, x)
// --> [satisfies, doesnt]

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

var x = new Map([['a', 1], ['b', 2], ['c', 3], ['d', 4]]);
map.partition(x, v => v % 2 == 0);
// [ Map(2) { 'b' => 2, 'd' => 4 }, Map(2) { 'a' => 1, 'c' => 3 } ]

var x = new Map([['a', 1], ['b', 2], ['c', 3], ['d', 4], ['e', 5]]);
map.partition(x, v => v % 2 == 1);
// [
//   Map(3) { 'a' => 1, 'c' => 3, 'e' => 5 },
//   Map(2) { 'b' => 2, 'd' => 4 }
// ]

references

• Data.List.partition: Haskell