Create 1678-merge-strings-alternately.js

Author: everthis

1678-merge-strings-alternately.js

@@ -0,0 +1,21 @@
+/**
+ * @param {string} word1
+ * @param {string} word2
+ * @return {string}
+ */
+var mergeAlternately = function(word1, word2) {
+  let res = '', mark = 0, i = 0, j = 0
+  while(i < word1.length && j < word2.length) {
+    if(mark === 0) {
+      res += word1[i++]
+      mark = 1
+    } else {
+      res += word2[j++]
+      mark = 0
+    }
+  }
+  while(i < word1.length) res += word1[i++]
+  while(j < word2.length) res += word2[j++]
+  
+  return res
+};