flatMap

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

Flattens nested set, using map function. 🏃 📼 📦 🌔 📒

Alternatives: flat, flatMap.

set.flatMap(x, [fn]);
// x:  a nested set
// fn: map function (v, v, x)

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

var x = new Set([
  new Set([1, 2]),
  new Set([3, new Set([4, new Set([5])])])
]);
set.flatMap(x);
// Set(4) { 1, 2, 3, Set(2) { 4, Set(1) { 5 } } }

set.flatMap(x, v => set.flat(v, 1));
// Set(5) { 1, 2, 3, 4, Set(1) { 5 } }

set.flatMap(x, v => set.flat(v));
// Set(5) { 1, 2, 3, 4, 5 }

references