searchSubsequence

Finds first index of a subsequence. 🏃 📼 📦 🌔 📒

Similar: hasPrefix, hasInfix, hasSuffix, hasSubsequence.
Similar: search, scan, find.

iterable.searchSubsequence(x, y, [fc], [fm]);
// x:  an iterable
// y:  search subsequence
// fc: compare function (a, b)
// fm: map function (v, i, x)
// --> start index of subsequence, -1 if not found

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

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

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

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

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

references

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