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Find the Index of the First Occurrence in a String

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Problem statement

Return the zero-based index of the first occurrence of needle in haystack. Return -1 when no occurrence exists. An empty needle occurs at index 0.

Function

findFirstOccurrence(haystack: String, needle: String) → int

Examples

Example 1

haystack = "sadbutsad"needle = "sad"return = 0

The first match starts at index 0.

Constraints

Both strings contain at most 10^5 lowercase English letters.

Source note: Author-written prompt excerpt retained for source fidelity.