Finds first index of a subsequence. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

Similar: subsequence, subsequences, hasSubsequence, searchSubsequence. Similar: hasValue, hasPrefix, hasInfix, hasSuffix, hasSubsequence, hasPermutation.

This is part of package extra-array.

array.searchSubsequence(x, y, [fc], [fm]);
// x:  an array
// y:  subsequence?
// fc: compare function (a, b)
// fm: map function (v, i, x)

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

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

array.searchSubsequence(x, [-2, -4]);
// -1

array.searchSubsequence(x, [-2, -4], (a, b) => Math.abs(a) - Math.abs(b));
// 1

array.searchSubsequence(x, [-2, -4], null, v => Math.abs(v));
// 1

References

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