题解 | 验证IP地址

/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 * 验证IP地址
 * @param IP string字符串 一个IP地址字符串
 * @return string字符串
 */
function solve(IP) {
    // write code here
    // console.log(IP)
    let arrs = [];
    if (IP.includes(".")) {
        arrs = IP.split(".");
        if (arrs.length === 4) {
            let valid = arrs.every((num) => {
                if (num == "") {
                    return false;
                }
                if (num.length > 1 && num[0] == 0) {
                    return false;
                }
                let n = Number(num);
                if (0 <= n && n <= 255) {
                    return true;
                } else {
                    return false;
                }
            });
            if (valid) {
                return "IPv4";
            } else {
                return "Neither";
            }
        } else {
            return "Neither";
        }
    } else {
        arrs = IP.split(":");
        if (arrs.length === 8) {
            let valid = arrs.every((num) => {
                if (num === "") {
                    return false;
                }
                if (num.length > 4) {
                    return false;
                }
                return /^[0-9A-Fa-f]+$/.test(num)
            });
            if (valid) {
                return "IPv6";
            } else {
                return "Neither";
            }
        } else {
            return "Neither";
        }
    }
    // console.log(arrs)
}
module.exports = {
    solve: solve,
};