Find the Index of the First Occurrence in a String

Challenge Points: 10

Level: Easy

You are given two strings: text and pattern.

Return the index of the first place pattern appears in text.
If pattern does not appear, return -1.

Input: text = "hellohello", pattern = "llo"

Output: 2

Explanation:

"llo" first appears starting at index 2.

Input: text = "openai", pattern = "ai"

Output: 4

Explanation:

"ai" appears first at index 4.

Input: text = "python", pattern = "java"

Output: -1

Explanation:

java" is not in "python".

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