add javascript solution for 014

Author: limbowandering

solution/014.Longest Common Prefix/Solution.js

@@ -0,0 +1,11 @@
+const longestCommonPrefix = function(strs){
+  if(strs.length === 0) return '';
+  for(let j = 0; j < strs[0].length; j++){
+    for(let i = 0; i < strs.length; i++){
+      if(strs[0][j] !== strs[i][j]){
+        return strs[0].substring(0,j);
+      }
+    }
+  }
+  return strs[0];
+}