Create 665-non-decreasing-array.js

Author: everthis

665-non-decreasing-array.js

@@ -0,0 +1,21 @@
+/**
+ * @param {number[]} nums
+ * @return {boolean}
+ */
+const checkPossibility = function(nums) {
+  let count = 0;
+  let idx;
+  if (nums.length === 1) return true;
+  for (let i = 1; i < nums.length; i++) {
+    if (nums[i - 1] > nums[i]) {
+      count++;
+      idx = i;
+    }
+  }
+  if (count > 1) return false;
+  if (idx === nums.length - 1 || idx === 1) return true;
+  return (
+    Math.max(...nums.slice(0, idx - 1)) <= Math.min(...nums.slice(idx)) ||
+    Math.max(...nums.slice(0, idx)) <= Math.min(...nums.slice(idx + 1))
+  );
+};