题解 | #反转字符串#

/**
 * 反转字符串
 * @param str string字符串
 * @return string字符串
 */
function solve(str) {
    // write code here
    // 1. 直接for循环从尾到头
    // 2. 双指针，头尾对换
    let len = parseInt(str.length / 2);
    let s;
    let strArr = [...str];
    for (let i = 0; i < len; i++) {
        let j = strArr.length - 1 - i;
        s = strArr[i];
        strArr[i] = strArr[j];
        strArr[j] = s;
        //console.log(str)
    }
    //更巧妙
    // let left = 0;
    // let right = str.length - 1;
    // let strArr = [...str];
    // while (left < right)
    //     [strArr[left++], strArr[right--]] = [strArr[right], strArr[left]];

    return strArr.join("");
	
	//一行代码
	//var arr = str.split('').reverse().join(''); 
    //return arr
}
module.exports = {
    solve: solve,
};