isSubsequence.js

////////////////////////////////////////////////Is Subsequence///////////////////////////////////////////
// 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
/**
 * @param {string} s
 * @param {string} t
 * @return {boolean}
 */
 const isSubsequence = function(s, t) {
    let i = 0, j = 0;
    while(i < s.length){
        if(j === t.length){
            return false;
        }
        if(s[i] === t[j]){
            i++;
        }
        j++;
    };
    return true;
};

// console.log(isSubsequence("abc", "ahbgdc"));
// console.log(isSubsequence("axc", "ahbgdc"));