# 28 Implement strStr()

LeetCode

Implement strStr().

Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

Example 1:

Input: haystack = "hello", needle = "ll"
Output: 2
Example 2:

Input: haystack = "aaaaa", needle = "bba"
Output: -1
Clarification:

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}
 */
var strStr = function(haystack, needle) {};

怎麼解

抱歉我直接用原生方法了

var strStr = function(haystack, needle) {
    return haystack.indexOf(needle)
};

console.log(strStr("hello", "ll"))
// faster than 67.12% of JavaScript online submissions for Implement strStr().