Create 1051-height-checker.js

Author: everthis

1051-height-checker.js

@@ -0,0 +1,13 @@
+/**
+ * @param {number[]} heights
+ * @return {number}
+ */
+const heightChecker = function(heights) {
+  const arr = heights.slice(0).sort((a, b) => a - b)
+  let res = 0
+  for(let i = 0, len = heights.length; i < len; i++) {
+    if(arr[i] !== heights[i]) res++
+  }
+  
+  return res
+};