392. Is Subsequence

Description

Given two strings s and t, return true if s is a subsequence of t, or false otherwise.

A subsequence of a string is a new string that is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (i.e., "ace" is a subsequence of "abcde" while "aec" is not).

Example 1:

  Input: s = "abc", t = "ahbgdc"
  Output: true

Example 2:

  Input: s = "axc", t = "ahbgdc"
  Output: false

Constraints:

• 0 <= s.length <= 100 - 0 <= t.length <= 10^4
• s and t consist only of lowercase English letters.

My Solution

 
// Solution using Two pointers
/**
 * @param {string} s
 * @param {string} t
 * @return {boolean}
 */
var isSubsequence = function (s, t) {
  let i = 0;
  let j = 0;
  while(i < s.length && j < t.length) {
    if(s[i] === t[j]) i++;
    j++;
  }
  return i === s.length;
}