SOURCE

// 1.原地反转字符串
function reverseString(str) {
    return str.split(' ').reverse().join(' ').split('').reverse().join('')
}

//console.log(reverseString('I am the good boy'));


//2.判断是否回文
function isPalindrome(str) {
    let left = 0;
    let right = str.length - 1;
    while (left < right) {
        if (str.charAt(left) !== str.charAt(right))
            return false;
        left++
        right--
    }
    return true
}

// console.log(isPalindrome("amaddam"))

// 3.格式化日期
const dateFormat = function(date, format) {
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    var day = date.getDate()
    format = format.replace(/yyyy/, year);
    format = format.replace(/mm/, month);
    format = format.replace(/dd/, day);
    return format
}

// console.log(dateFormat(new Date('2022-10-6'), 'yyyy/mm/dd'));

// 4.数组乱序
const disturbIndex = function(array) {
        let len = array.length;
        while (len) {
            let randomIndex = Math.floor(Math.random() * len--);
            let temp = array[len];
            array[len] = array[randomIndex];
            array[randomIndex] = temp;
        }
        return array;
    }
    // console.log(disturbIndex([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]));

// 5.数组扁平化
function flatten(arr) {
    return arr.reduce((prev, every) => {
        prev = prev.concat(Array.isArray(every) ? flatten(every) : every);
        return prev;
    }, [])
}

// console.log(flatten([1, [2, [3, 4, 5]]]));

// 5.解析url
let url = 'http://www.domain.com/?user=anonymous&id=123&id=456&city=%E5%8C%97%E4%BA%AC&enabled';
var parseParam = function(url) {
        let paramStr = /.+\?(.+)$/.exec(url)[1];
        let paramArr = paramStr.split('&');
        let paramObj = {};
        paramArr.forEach((str) => {
            if (/=/.test(str)) {
                let [key, val] = str.split('=');
                val = decodeURIComponent(val);
                val = /^\d+$/.test(val) ? parseFloat(val) : val;
                if (paramObj.hasOwnProperty(key)) {
                    paramObj[key] = [].concat(paramObj[key], val);
                } else {
                    paramObj[key] = val;
                }
            } else {
                paramObj[str] = true;
            }
        })
        return paramObj;
    }
    // console.log(parseParam(url));