Add solution to day 26

04- April/26- Add Digits/26- Add Digits (Ahmed Gamal).js

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+// Autor: Ahmed Gamal
+
+// the idea for this solution is so simple, we will loop until the number is less than 10
+// in each iteration we will calculate the sum of the digits of the number
+
+/**
+ * @param {number} num
+ * @return {number}
+ */
+var addDigits = function(num) {
+    // loop until the number is less than 10
+    while(num > 10) {
+        // calculate the sum of the digits of the number
+        // x: copy of the number to not change the original number
+        // sum: the sum of the digits of the number
+
+        // loop until the number is 0
+        // in each iteration we will add the last digit to the sum
+        // and remove the last digit from the number
+
+        let x = num, sum = 0;
+        while(x) {
+            sum += x % 10;
+            x = Math.floor(x / 10);
+        }
+
+        // update the number with the sum
+        num = sum;
+    }
+
+    // return the number
+    return num;
+};