Checks if array has a subsequence. :running: :vhs: :package: :moon:

Alternatives: compare, map. Similar: subsequence, subsequences, isSubsequence. This is part of package extra-array.

array.isSubsequenceOn(x, y, [fn], [ths]);
// x:   an array
// y:   subsequence?
// fn:  map function (v, i, x)
// ths: this argument

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

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

array.isSubsequenceOn(x, [-2, -4]);
// false

array.isSubsequenceOn(x, [-2, -4], v => Math.abs(v));
// true

references

• Data.List.isSubsequenceOf: Haskell
• List-Extra.isSubsequenceOf: elm