additional condition within the for loop

the loop should stop once it has traversed the substring

Author: aestheticw3

javascript/0392-is-subsequence.js

@@ -11,7 +11,7 @@ var isSubsequence = function(s, t) {
 
     let j = 0;
 
-    for(let i = 0; i < t.length; i++) {
+    for(let i = 0; i < t.length && j < s.length; i++) {
         if(s[j] === t[i]) {
             j++;
         }