Flattens nested array, based on map function. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

Alternatives: flat, flatMap.

This is part of package extra-array.

array.flatMap(x, [fm], [ft]);
// x:  an array
// fm: map function (v, i, x)
// ft: test function (v, i, x)

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

var x = [[1, 2], [3, [4, [5]]]];
array.flatMap(x);
// [ 1, 2, 3, [ 4, [ 5 ] ] ]

array.flatMap(x, v => array.flat(v, 1));
// [ 1, 2, 3, 4, [ 5 ] ]

array.flatMap(x, v => array.flat(v));
// [ 1, 2, 3, 4, 5 ]

References

• Array.prototype.flatMap: MDN web docs
• _.flatten: lodash