Create 2124-check-if-all-as-appears-before-all-bs.js

Author: everthis

2124-check-if-all-as-appears-before-all-bs.js

@@ -0,0 +1,9 @@
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+const checkString = function(s) {
+  const la = s.lastIndexOf('a')
+  const fb = s.indexOf('b')
+  return fb === -1 ? true : la < fb
+};