JS commonly used tool function finishing

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1. isStatic: Check whether the data is raw data except symbol.

function isStatic(value) {
    return (
        typeof value === 'string' ||
        typeof value === 'number' ||
        typeof value === 'boolean' ||
        typeof value === 'undefined' ||
        value === null
    )
}

2. isPrimitive: Check whether the data is raw data

function isPrimitive(value) {
    return isStatic(value) || typeof value === 'symbol'
}

3. isObject: Determine whether the data is a reference type data (for example: array, function, object, regexe, new Number(), new String())

function isObject(value) {
    let type = typeof value;
    return value != null && (type == 'object' || type == 'function');
}

4. isObjectLike: Check whether value is a class object. If a value is a class object, then it should not be null, and the result after typeof is "object".

function isObjectLike(value) {
    return value != null && typeof value == 'object';
}

5. getRawType: Get the data type, the return result is Number, String, Object, Array, etc.

function getRawType(value) {
    return Object.prototype.toString.call(value).slice(8, -1)
}
// getoRawType([]) ⇒ Array

6, isPlainObject: Determine whether the data is Object type data

function isPlainObject(obj) {
    return Object.prototype.toString.call(obj) === '[object Object]'
}

7. isArray: Determine whether the data is array type data (compatible writing of Array.isArray)

function isArray(arr) {
    return Object.prototype.toString.call(arr) === '[object Array]'
}

// 将isArray挂载到Array上
Array.isArray = Array.isArray || isArray;

8. isRegExp: Determine whether the data is a regular object

function isRegExp(value) {
    return Object.prototype.toString.call(value) === '[object RegExp]'
}

9. isDate: Determine whether the data is a time object

function isDate(value) {
    return Object.prototype.toString.call(value) === '[object Date]'
}

10. isNative: Determine whether value is a built-in function of the browser
The main code block after the built-in function toString is [native code], while the non-built-in function is the relevant code, so the non-built-in function can be copied (after toString, cut the head and tail and then transfer it from Function)

function isNative(value) {
    return typeof value === 'function' && /native code/.test(value.toString())
}

11. isFunction: Check whether value is a function

function isFunction(value) {
    return Object.prototype.toString.call(value) === '[object Function]'
}

12. isLength: Check whether value is a valid array-like length

function isLength(value) {
    return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= Number.MAX_SAFE_INTEGER;
}

13, isArrayLike: Check whether the value is an array-like
If a value is considered an array-like, then it is not a function, and value.length is an integer, greater than or equal to 0, less than or equal to Number.MAX_SAFE_INTEGER. Here the string is also treated as an array-like.

function isArrayLike(value) {
    return value != null && isLength(value.length) && !isFunction(value);
}

14. isEmpty: Check whether the value is empty
If it is null, return true directly; if it is a class array, determine the length of the data; if it is an Object object, determine whether it has attributes; if it is other data, return false directly (you can also return true)

function isEmpty(value) {
    if (value == null) {
        return true;
    }
    if (isArrayLike(value)) {
        return !value.length;
    } else if (isPlainObject(value)) {
        for (let key in value) {
            if (hasOwnProperty.call(value, key)) {
                return false;
            }
        }
    }
    return false;
}

15. Cached: memory function: the calculation result of the cache function

function cached(fn) {
    let cache = Object.create(null);
    return function cachedFn(str) {
        let hit = cache[str];
        return hit || (cache[str] = fn(str))
    }
}

16, camelize: naming the horizontal line to the hump

let camelizeRE = /-(\w)/g;
function camelize(str) {
    return str.replace(camelizeRE, function(_, c) {
        return c ? c.toUpperCase() : '';
    })
}
//ab-cd-ef ==> abCdEf
//使用记忆函数
let _camelize = cached(camelize)

17, hyphenate: hump naming to horizontal line naming: split the string, use-to connect, and convert to lowercase

let hyphenateRE = /\B([A-Z])/g;
function hyphenate(str){
    return str.replace(hyphenateRE, '-$1').toLowerCase()
}
//abCd ==> ab-cd
//使用记忆函数
let _hyphenate = cached(hyphenate);

18. Capitalize: capitalize the first character of the string

function capitalize(str) {
    return str.charAt(0).toUpperCase() + str.slice(1)
}
// abc ==> Abc
//使用记忆函数
let _capitalize = cached(capitalize)

19. extend: mix attributes into the target object

function extend(to, _form) {
    for(let key in _form) {
        to[key] = _form[key];
    }
    return to
}

20. Object.assign: object attribute copy, shallow copy

Object.assign = Object.assign || function() {
    if (arguments.length == 0) throw new TypeError('Cannot convert undefined or null to object');
    let target = arguments[0],
        args = Array.prototype.slice.call(arguments, 1),
        key;
    args.forEach(function(item) {
        for (key in item) {
            item.hasOwnProperty(key) && (target[key] = item[key])
        }
    })
    return target
}

Use Object.assign to clone an object:

let clone = Object.assign({}, target);

Simple deep cloning can use JSON.parse() and JSON.stringify(). These two apis parse json data, so they can only parse primitive types, arrays and objects except symbols.

let clone = JSON.parse( JSON.stringify(target) )

21. Clone: clone data, deep clone
Here is a list of primitive types, time, regularity, error, array, object cloning rules, others can be supplemented by yourself

function clone(value, deep) {
    if (isPrimitive(value)) {
        return value
    }
    if (isArrayLike(value)) {  //是类数组
        value = Array.prototype.slice.call(vall)
        return value.map(item => deep ? clone(item, deep) : item)
    } else if (isPlainObject(value)) {  //是对象
        let target = {}, key;
        for (key in value) {
            value.hasOwnProperty(key) && ( target[key] = deep ? clone(value[key], value[key] ))
        }
    }
    let type = getRawType(value);
    switch(type) {
        case 'Date':
        case 'RegExp':
        case 'Error': value = new window[type](value); break;
    }
    return value
}

22. Identify various browsers and platforms

//运行环境是浏览器
let inBrowser = typeof window !== 'undefined';
//运行环境是微信
let inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;
let weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();
//浏览器 UA 判断
let UA = inBrowser && window.navigator.userAgent.toLowerCase();
let isIE = UA && /msie|trident/.test(UA);
let isIE9 = UA && UA.indexOf('msie 9.0') > 0;
let isEdge = UA && UA.indexOf('edge/') > 0;
let isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');
let isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
let isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;

23. getExplorerInfo: Get browser information

function getExplorerInfo() {
    let t = navigator.userAgent.toLowerCase();
    return 0 <= t.indexOf("msie") ? { //ie < 11
        type: "IE",
        version: Number(t.match(/msie ([\d]+)/)[1])
    } : !!t.match(/trident\/.+?rv:(([\d.]+))/) ? { // ie 11
        type: "IE",
        version: 11
    } : 0 <= t.indexOf("edge") ? {
        type: "Edge",
        version: Number(t.match(/edge\/([\d]+)/)[1])
    } : 0 <= t.indexOf("firefox") ? {
        type: "Firefox",
        version: Number(t.match(/firefox\/([\d]+)/)[1])
    } : 0 <= t.indexOf("chrome") ? {
        type: "Chrome",
        version: Number(t.match(/chrome\/([\d]+)/)[1])
    } : 0 <= t.indexOf("opera") ? {
        type: "Opera",
        version: Number(t.match(/opera.([\d]+)/)[1])
    } : 0 <= t.indexOf("Safari") ? {
        type: "Safari",
        version: Number(t.match(/version\/([\d]+)/)[1])
    } : {
        type: t,
        version: -1
    }
}

24. isPCBroswer: Check whether it is the PC browser mode

function isPCBroswer() {
    let e = navigator.userAgent.toLowerCase()
        , t = "ipad" == e.match(/ipad/i)
        , i = "iphone" == e.match(/iphone/i)
        , r = "midp" == e.match(/midp/i)
        , n = "rv:1.2.3.4" == e.match(/rv:1.2.3.4/i)
        , a = "ucweb" == e.match(/ucweb/i)
        , o = "android" == e.match(/android/i)
        , s = "windows ce" == e.match(/windows ce/i)
        , l = "windows mobile" == e.match(/windows mobile/i);
    return !(t || i || r || n || a || o || s || l)
}

25. Unique: de-duplicate the array and return a new array

function unique(arr){
    if(!isArrayLink(arr)){ //不是类数组对象
        return arr
    }
    let result = []
    let objarr = []
    let obj = Object.create(null)
    
    arr.forEach(item => {
        if(isStatic(item)){//是除了symbol外的原始数据
            let key = item + '_' + getRawType(item);
            if(!obj[key]){
                obj[key] = true
                result.push(item)
            }
        }else{//引用类型及symbol
            if(!objarr.includes(item)){
                objarr.push(item)
                result.push(item)
            }
        }
    })
    
    return resulte
}

26, Set simple implementation

window.Set = window.Set || (function () {
    function Set(arr) {
        this.items = arr ? unique(arr) : [];
        this.size = this.items.length; // Array的大小
    }
    Set.prototype = {
        add: function (value) {
            // 添加元素,若元素已存在,则跳过,返回 Set 结构本身。
            if (!this.has(value)) {
                this.items.push(value);
                this.size++;
            }
            return this;
        },
        clear: function () {
            //清除所有成员,没有返回值。
            this.items = []
            this.size = 0
        },
        delete: function (value) {
            //删除某个值,返回一个布尔值,表示删除是否成功。
            return this.items.some((v, i) => {
                if(v === value){
                    this.items.splice(i,1)
                    return true
                }
                return false
            })
        },
        has: function (value) {
            //返回一个布尔值,表示该值是否为Set的成员。
            return this.items.some(v => v === value)
        },
        values: function () {
            return this.items
        },
    }

    return Set;
}());

27. Repeat: Generate a repeated string consisting of n str, which can be modified to fill in an array, etc.

function repeat(str, n) {
    let res = '';
    while(n) {
        if(n % 2 === 1) {
            res += str;
        }
        if(n > 1) {
            str += str;
        }
        n >>= 1;
    }
    return res
};
//repeat('123',3) ==> 123123123

28, dateFormater: format the time

function dateFormater(formater, t){
    let date = t ? new Date(t) : new Date(),
        Y = date.getFullYear() + '',
        M = date.getMonth() + 1,
        D = date.getDate(),
        H = date.getHours(),
        m = date.getMinutes(),
        s = date.getSeconds();
    return formater.replace(/YYYY|yyyy/g,Y)
        .replace(/YY|yy/g,Y.substr(2,2))
        .replace(/MM/g,(M<10?'0':'') + M)
        .replace(/DD/g,(D<10?'0':'') + D)
        .replace(/HH|hh/g,(H<10?'0':'') + H)
        .replace(/mm/g,(m<10?'0':'') + m)
        .replace(/ss/g,(s<10?'0':'') + s)
}
// dateFormater('YYYY-MM-DD HH:mm', t) ==> 2019-06-26 18:30
// dateFormater('YYYYMMDDHHmm', t) ==> 201906261830

29. dateStrForma: Convert the specified string from one time format to another. The format of From should correspond to the position of str

function dateStrForma(str, from, to){
    //'20190626' 'YYYYMMDD' 'YYYY年MM月DD日'
    str += ''
    let Y = ''
    if(~(Y = from.indexOf('YYYY'))){
        Y = str.substr(Y, 4)
        to = to.replace(/YYYY|yyyy/g,Y)
    }else if(~(Y = from.indexOf('YY'))){
        Y = str.substr(Y, 2)
        to = to.replace(/YY|yy/g,Y)
    }

    let k,i
    ['M','D','H','h','m','s'].forEach(s =>{
        i = from.indexOf(s+s)
        k = ~i ? str.substr(i, 2) : ''
        to = to.replace(s+s, k)
    })
    return to
}
// dateStrForma('20190626', 'YYYYMMDD', 'YYYY年MM月DD日') ==> 2019年06月26日
// dateStrForma('121220190626', '----YYYYMMDD', 'YYYY年MM月DD日') ==> 2019年06月26日
// dateStrForma('2019年06月26日', 'YYYY年MM月DD日', 'YYYYMMDD') ==> 20190626

// 一般的也可以使用正则来实现
//'2019年06月26日'.replace(/(\d{4})年(\d{2})月(\d{2})日/, '$1-$2-$3') ==> 2019-06-26

30. getPropByPath: Obtain object properties according to the string path:'obj[0].count'

function getPropByPath(obj, path, strict) {
      let tempObj = obj;
      path = path.replace(/\[(\w+)\]/g, '.$1'); //将[0]转化为.0
      path = path.replace(/^\./, ''); //去除开头的.

      let keyArr = path.split('.'); //根据.切割
      let i = 0;
      for (let len = keyArr.length; i < len - 1; ++i) {
        if (!tempObj && !strict) break;
        let key = keyArr[i];
        if (key in tempObj) {
            tempObj = tempObj[key];
        } else {
            if (strict) {//开启严格模式,没找到对应key值,抛出错误
                throw new Error('please transfer a valid prop path to form item!');
            }
            break;
        }
      }
      return {
        o: tempObj, //原始数据
        k: keyArr[i], //key值
        v: tempObj ? tempObj[keyArr[i]] : null // key值对应的值
      };
};

31. GetUrlParam: Get the Url parameter and return an object

function GetUrlParam(){
    let url = document.location.toString();
    let arrObj = url.split("?");
    let params = Object.create(null)
    if (arrObj.length > 1){
        arrObj = arrObj[1].split("&");
        arrObj.forEach(item=>{
            item = item.split("=");
            params[item[0]] = item[1]
        })
    }
    return params;
}
// ?a=1&b=2&c=3 ==> {a: "1", b: "2", c: "3"}

32. downloadFile: base64 data export file, file download

function downloadFile(filename, data) {
    let DownloadLink = document.createElement('a');
    if (DownloadLink) {
        document.body.appendChild(DownloadLink);
        DownloadLink.style = 'display: none';
        DownloadLink.download = filename;
        DownloadLink.href = data;
        if (document.createEvent) {
            let DownloadEvt = document.createEvent('MouseEvents');
            DownloadEvt.initEvent('click', true, false);
            DownloadLink.dispatchEvent(DownloadEvt);
        } else if (document.createEventObject) {
            DownloadLink.fireEvent('onclick');
        } else if (typeof DownloadLink.onclick == 'function') {
            DownloadLink.onclick();
        }
        document.body.removeChild(DownloadLink);
    }
}

33, toFullScreen: full screen

function toFullScreen() {
    let elem = document.body;
    elem.webkitRequestFullScreen
    ? elem.webkitRequestFullScreen()
    : elem.mozRequestFullScreen
    ? elem.mozRequestFullScreen()
    : elem.msRequestFullscreen
    ? elem.msRequestFullscreen()
    : elem.requestFullScreen
    ? elem.requestFullScreen()
    : alert("浏览器不支持全屏");
}

34, exitFullscreen: Exit full screen

function exitFullscreen() {
    let elem = parent.document;
    elem.webkitCancelFullScreen
    ? elem.webkitCancelFullScreen()
    : elem.mozCancelFullScreen
    ? elem.mozCancelFullScreen()
    : elem.cancelFullScreen
    ? elem.cancelFullScreen()
    : elem.msExitFullscreen
    ? elem.msExitFullscreen()
    : elem.exitFullscreen
    ? elem.exitFullscreen()
    : alert("切换失败,可尝试Esc退出");
}

35, requestAnimationFrame: window animation

window.requestAnimationFrame = window.requestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    window.oRequestAnimationFrame ||
    function (callback) {
        //为了使setTimteout的尽可能的接近每秒60帧的效果
        window.setTimeout(callback, 1000 / 60);
    }
window.cancelAnimationFrame = window.cancelAnimationFrame ||
    window.webkitCancelAnimationFrame ||
    window.mozCancelAnimationFrame ||
    window.msCancelAnimationFrame ||
    window.oCancelAnimationFrame ||
    function (id) {
        //为了使setTimteout的尽可能的接近每秒60帧的效果
        window.clearTimeout(id);
    }

36, _isNaN: check whether the data is a non-digital value

function _isNaN(v){
    return !(typeof v === 'string' || typeof v === 'number') || isNaN(v)
}

37, max: find the maximum value of the non-NaN data in the array

function max(arr){
    arr = arr.filter(item => !_isNaN(item))
    return arr.length ? Math.max.apply(null, arr) : undefined
}
//max([1, 2, '11', null, 'fdf', []]) ==> 11

38. min: find the minimum value of the non-NaN data in the array

function min(arr){
    arr = arr.filter(item => !_isNaN(item))
    return arr.length ? Math.min.apply(null, arr) : undefined
}
//min([1, 2, '11', null, 'fdf', []]) ==> 1

39. random: returns a lower-upper direct random number. (Regardless of the sign of lower and upper, they must be non-NaN data)

function random(lower, upper) {
    lower = +lower || 0
    upper = +upper || 0
    return Math.random() * (upper - lower) + lower;
}
//random(0, 0.5) ==> 0.3567039135734613
//random(2, 1) ===> 1.6718418553475423
//random(-2, -1) ==> -1.4474325452361945

40. Object.keys: returns an array consisting of the enumerable properties of a given object

Object.keys = Object.keys || function keys(object) {
    if (object === null || object === undefined) {
        throw new TypeError('Cannot convert undefined or null to object');
    }
    let result = [];
    if (isArrayLike(object) || isPlainObject(object)) {
        for (let key in object) {
            object.hasOwnProperty(key) && (result.push(key))
        }
    }
    return result;
}

41. Object.values: returns an array of all enumerable property values of a given object itself

Object.values = Object.values || function values(object) {
    if (object === null || object === undefined) {
        throw new TypeError('Cannot convert undefined or null to object');
    }
    let result = [];
    if (isArrayLike(object) || isPlainObject(object)) {
        for (let key in object) {
            object.hasOwnProperty(key) && (result.push(object[key]))
        }
    }
    return result;
}

42. arr.fill: Fill the array with value, starting at the start position and ending at the end position (but not including the end position), and return to the original array

Array.prototype.fill = Array.prototype.fill || function fill(value, start, end) {
    let ctx = this
    let length = ctx.length;
    
    start = parseInt(start)
    if(isNaN(start)){
        start = 0
    }else if (start < 0) {
        start = -start > length ? 0 : (length + start);
      }
      
      end = parseInt(end)
      if(isNaN(end) || end > length){
          end = length
      }else if (end < 0) {
        end += length;
    }
    
    while (start < end) {
        ctx[start++] = value;
    }
    return ctx;
}
//Array(3).fill(2) ===> [2, 2, 2]

43. arr.includes: used to determine whether an array contains a specified value, if it returns true, otherwise it returns false, you can specify the location to start the query

Array.prototype.includes = Array.prototype.includes || function includes(value, start) {
    let ctx = this;
    let length = ctx.length;
    start = parseInt(start)
    if(isNaN(start)) {
        start = 0
    } else if (start < 0) {
        start = -start > length ? 0 : (length + start);
    }
    let index = ctx.indexOf(value);
    return index >= start;
}

44. Returns the value of the first element in the array that passes the test (judged in the function fn)

Array.prototype.find = Array.prototype.find || function find(fn, ctx) {
    ctx = ctx || this;
    let result;
    ctx.some((value, index, arr), thisValue) => {
        return fn(value, index, arr) ? (result = value, true) : false
    })
    return result
}

45. arr.findIndex: returns the index of the first element in the array that passes the test (judged in the function fn)

Array.prototype.findIndex = Array.prototype.findIndex || function findIndex(fn, ctx){
    ctx = ctx || this
    
    let result;
    ctx.some((value, index, arr), thisValue) => {
        return fn(value, index, arr) ? (result = index, true) : false
    })
    
    return result
}

46. performance.timing: use performance.timing for performance analysis

window.onload = function() {
    setTimeout(function() {
        let t = performance.timing;
        console.log('DNS查询耗时 :' + (t.domainLookupEnd - t.domainLookupStart).toFixed(0))
        console.log('TCP链接耗时 :' + (t.connectEnd - t.connectStart).toFixed(0))
        console.log('request请求耗时 :' + (t.responseEnd - t.responseStart).toFixed(0))
        console.log('解析dom树耗时 :' + (t.domComplete - t.domInteractive).toFixed(0))
        console.log('白屏时间 :' + (t.responseStart - t.navigationStart).toFixed(0))
        console.log('domready时间 :' + (t.domContentLoadedEventEnd - t.navigationStart).toFixed(0))
        console.log('onload时间 :' + (t.loadEventEnd - t.navigationStart).toFixed(0))
        if (t = performance.memory) {
            console.log('js内存使用占比:' +  (t.usedJSHeapSize / t.totalJSHeapSize * 100).toFixed(2) + '%')
        }
    })
}

47, prohibit certain keyboard events

document.addEventListener('keydown', function(event) {
    return !(
        112 == event.keyCode ||        //禁止F1
        123 == event.keyCode ||        //禁止F12
        event.ctrlKey && 82 == event.keyCode ||        //禁止ctrl+R
        event.ctrlKey && 18 == event.keyCode ||        //禁止ctrl+N
        event.shiftKey && 121 == event.keyCode ||          //禁止shift+F10
        event.altKey && 115 == event.keyCode ||        //禁止alt+F4
        "A" == event.srcElement.tagName && event.shiftKey        //禁止shift+点击a标签
    ) || (event.returnValue = false)
});

48. Right-click, select, and copy are prohibited

['contextmenu', 'selectstart', 'copy'].forEach(function(ev) {
    document.addEventListener(ev, function(event) {
        return event.returnValue = false;
    })
});

49, numAdd--Calculate the addition of numbers

function numAdd(num1, num2) {
    let baseNum, baseNum1, baseNum2;
    try {
        baseNum1 = num1.toString().split(".")[1].length;
    } catch (e) {
        baseNum1 = 0;
    }
    try {
        baseNum2 = num2.toString().split(".")[1].length;
    } catch (e) {
        baseNum2 = 0;
    }
    baseNum = Math.pow(10, Math.max(baseNum1, baseNum2));
    return (num1 * baseNum + num2 * baseNum) / baseNum;
};

50, numSub--Calculate number subtraction

function numSub(num1, num2) {
    let baseNum, baseNum1, baseNum2;
    let precision;// 精度
    try {
        baseNum1 = num1.toString().split(".")[1].length;
    } catch (e) {
        baseNum1 = 0;
    }
    try {
        baseNum2 = num2.toString().split(".")[1].length;
    } catch (e) {
        baseNum2 = 0;
    }
    baseNum = Math.pow(10, Math.max(baseNum1, baseNum2));
    precision = (baseNum1 >= baseNum2) ? baseNum1 : baseNum2;
    return ((num1 * baseNum - num2 * baseNum) / baseNum).toFixed(precision);
};

51, numMulti--Calculate multiplication of numbers

function numMulti(num1, num2) {
    let baseNum = 0;
    try {
        baseNum += num1.toString().split(".")[1].length;
    } catch (e) {
    }
    try {
        baseNum += num2.toString().split(".")[1].length;
    } catch (e) {
    }
    return Number(num1.toString().replace(".", "")) * Number(num2.toString().replace(".", "")) / Math.pow(10, baseNum);
};

52, numDiv--Calculate the division of numbers

function numDiv(num1, num2) {
    let baseNum1 = 0, baseNum2 = 0;
    let baseNum3, baseNum4;
    try {
        baseNum1 = num1.toString().split(".")[1].length;
    } catch (e) {
        baseNum1 = 0;
    }
    try {
        baseNum2 = num2.toString().split(".")[1].length;
    } catch (e) {
        baseNum2 = 0;
    }
    with (Math) {
        baseNum3 = Number(num1.toString().replace(".", ""));
        baseNum4 = Number(num2.toString().replace(".", ""));
        return (baseNum3 / baseNum4) * pow(10, baseNum2 - baseNum1);
    }
};

53. Find the number of days between two days

const diffDays = (startDate, endDate) =>
    Math.ceil(
        Math.abs(new Date(startDate) - new Date(endDate)) /
            (1000 * 60 * 60 * 24)
    );

console.log(diffDays("2021-06-01", "2021-06-23")); // 22

54. Array sorting

const sort = (arr) => arr.sort((a, b) => a - b);
console.log(sort([10, 8, 2, 68, 3])); // [ 2, 3, 8, 10, 68 ]

55. Generate random hexadecimal colors

const randomColor = () =>
    `#${Math.random().toString(16).slice(2, 8).padStart(6, "0")}`;

const randomColor2 = () => `#${(~~(Math.random() * (1 << 24))).toString(16)}`;

console.log(randomColor()); // #4fd21f
console.log(randomColor2()); // #2c456b
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