7.整数反转

/*
 * @lc app=leetcode.cn id=7 lang=typescript
 *
 * [7] 整数反转
 */

// @lc code=start
function reverse(x: number): number {
	let s: string = String(x);
	if (s.endsWith("0")) {
		s = s.substring(0, s.length - 1); // 左闭右开
	}
	// 对s进行反转
	let arr = s.split("");
	let l = 0,
		r = arr.length - 1;
	while (l <= r) {
		if (arr[l] == "-") {
			l++;
		} else {
			[arr[l], arr[r]] = [arr[r], arr[l]];
			l++;
			r--;
		}
	}
	let res = Number(arr.join(""));
	return Math.abs(res) > Math.pow(2, 31) ? 0 : res;
}

console.log(reverse(12301));

// @lc code=end