Create 670-maximum-swap.js

Author: everthis

670-maximum-swap.js

@@ -0,0 +1,18 @@
+/**
+ * @param {number} num
+ * @return {number}
+ */
+const maximumSwap = function(num) {
+    const arr = ('' + num).split('')
+    for(let i = 0; i < arr.length - 1; i++) {
+        let cur = +arr[i]
+        let nextMax = Math.max(...arr.slice(i+1).map(el => +el))
+        if (nextMax > cur) {
+            let idx = arr.lastIndexOf(''+nextMax)
+            arr[i] = nextMax
+            arr[idx] = cur
+            break
+        }
+    }
+    return +(arr.join(''))
+};