feat: JavaScript solution to No. 7 Reverse Integer

javiermon · Jul 6, 2022 · 8252d8a · 8252d8a
1 parent 5c3d533
commit 8252d8a
Showing 1 changed file with 27 additions and 0 deletions.
diff --git a/javascript/7-Reverse-Integer.js b/javascript/7-Reverse-Integer.js
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+/**
+ * @param {number} x
+ * @return {number}
+ */
+const reverse = function (x) {
+ const max = 2 ** 31 - 1;
+ const min = -(2 ** 31);
+
+ let result = 0;
+ while (x !== 0) {
+ const digit = x % 10;
+ x = Math.trunc(x / 10);
+
+ if (result > max / 10 || (result === max / 10 && digit >= max % 10)) {
+ return 0;
+ } else if (
+ result < min / 10 ||
+ (result === max / 10 && digit <= min % 10)
+ ) {
+ return 0;
+ } else {
+ result = result * 10 + digit;
+ }
+ }
+
+ return result;
+};