Web Reference: Can you solve this real interview question? Find the Index of the First Occurrence in a String - Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Input: haystack = "sadbutsad", needle = "sad" Output: 0 Explanation: "sad" occurs at index 0 and 6. The first occurrence is at index 0, so we ... Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Output: 2. Example 2: Output: -1. Clarification: What should we return when needle is an empty string? This is a great question to ask during an interview. What should we return when needle is an empty string? This is a great question to ask during an interview. For the purpose of this problem, we will return 0 when needle is an empty string. This is consistent to C's strstr () and Java's indexOf (). * @param {string} haystack. * @param {string} needle. * @return {number} */ Complexity:
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