第 55 题：某公司 1 到 12 月份的销售额存在一个对象里面 #96

zeroone001 · 2019-04-15T23:23:50Z

let obj = {1:222, 2:123, 5:888};
obj.length = 12;
let _obj = Array.from(obj).slice(1);
let newObj =  _obj.map((item) => {if(item === undefined) {return null;} else {return item;}});
console.log(newObj);

let obj = {1:222, 2:123, 5:888};
obj.length = 12;
obj[Symbol.iterator] = Array.prototype[Symbol.iterator];
let _obj = [...obj].slice(1);
let newObj =  _obj.map((item) => {if(item === undefined) {return null;} else {return item;}});
console.log(newObj);

思考：

let _obj = [].slice.call(obj);

wangming-0215 · 2019-04-16T00:17:54Z

let obj = {1:222, 2:123, 5:888};
const result = Array.from({ length: 12 }).map((_, index) => obj[index + 1] || null);
console.log(result)

vivvn · 2019-04-16T00:24:26Z

let data = {1:222, 2:123, 5:888};
let arr = Array.from({length:12}).map((it,i)=> data[i+1]||null);
console.log(arr)

vivvn · 2019-04-16T00:33:54Z

let data = {1:222, 2:123, 5:888};
let arr = Array.from({length:12}).fill(null);
keys(data).forEach(it=>arr[it-1] = data[it]);
console.log(arr);

vivvn · 2019-04-16T00:36:57Z

console.time();
let data = {1:222, 2:123, 5:888};
let arr = Array.from({length:12}).map((it,i)=> data[i+1]||null);
console.log(arr);
// default: 2.119873046875ms
console.timeEnd();

console.time()
let obj = {1:222, 2:123, 5:888};
let res = Array.from({length:12}).fill(null);
keys(obj).forEach(it=>res[it-1] = obj[it]);
console.log(arr);
// default: 0.7451171875ms
console.timeEnd();

Seasonley · 2019-04-16T00:53:54Z

Array.from({length:12},(v,i)=>({1:222,2:123,5:888}[i+1])||null)

Moriarty02 · 2019-04-16T01:17:36Z

let obj = {1:222, 2:123, 5:888};
Array.from({length:12},(item,index)=>obj[index+1]||null)

WQHASH · 2019-04-16T01:27:22Z

怎么感觉我这好low啊！！

MaJiaXuan · 2019-04-16T01:29:10Z

var obj = {1:222, 2:123, 5:888}

var c = new Array(12).fill(true).reduce((prev, cur, key) => {
prev[key] = obj[key + 1] || null
return prev
}, [])

truexin1292 · 2019-04-16T01:29:58Z

// 1-12月份的销售额；
var obj = {
1: 222,
2: 123,
5: 888,
}
var arr = new Array(12).fill(null);
var finalArr = arr.map((v, i, curr) => {
if (obj[i + 1]) {
return obj[i + 1];
} else {
return null;
}
});
console.log('--log--:', finalArr)

Yanhua67 · 2019-04-16T01:32:41Z

Array.from(Object.assign(obj,{length:12}),v=>v===undefined?null:v)

GuoYuFu123 · 2019-04-16T01:39:43Z

vivvn · 2019-04-16T01:39:58Z

var obj = {1:222, 2:123, 5:888};
obj.length = 13;
Array.from(obj,it=>it||null).slice(1);

lxinr · 2019-04-16T01:48:24Z

let data = { 1:222, 2:123, 5:888 }
const arr = new Array(12).fill(null).map((item, i) => data[i + 1] || item)
console.log('arr---------', arr)

ZodiacSyndicate · 2019-04-16T01:55:38Z

const obj = {1:222, 2:123, 5:888}
const arr = Array.from({length: 12}, (_, index) => (index + 1) in obj ? obj[index + 1] : null)
console.log(arr)

NANAYWY · 2019-04-16T02:13:53Z

let obj=Object.assign({1:null,2:null,3:null,4:null,5:null,6:null,7:null,8:null,9:null,10:null,11:null,12:null},{1:222,2:123,5:888})
attr=Object.values(obj)
console.log(attr);

pangqiang · 2019-04-16T02:20:37Z

for循环是最快的。。
var obj = {1:222, 2:123, 5:888}
function hander(obj){
    let arr = [];
  console.time()
    for (let i = 1;i<=12;i++) {
        if(obj[i]){
            arr.push(obj[i])
        }else{
            arr.push(null)
        }
    }
    console.log(arr) // [222, 123, null, null, 888, null, null, null, null, null, null, null]
    console.timeEnd() //default: 0.4609375ms
}

zxcweb · 2019-04-16T02:27:03Z

const obj = {1:222, 2:123, 5:888};
const result = Array.from({length:12},(item,index)=>(obj[index+1]?obj[index+1]:null));
console.log(result)

zo11o · 2019-04-16T02:34:33Z

function formatData (data) {
let result = []
for (var i = 0; i < 12; i++) {
result[i] = null
}
let keys = Object.keys(data)
keys.forEach(o => {
result[parseInt(o) - 1] = data[o]
})

return result
}

var data = { 1: 222, 2: 123, 5: 888 }
formatData(data)

lvwxx · 2019-04-16T02:39:05Z

let obj = {1:222, 2:123, 5:888}
let arr = Array.from({length:12},(v,i) => obj[i+1] || null )

mandyshen97 · 2019-04-16T02:44:24Z

 let obj = {1:222,2:123,5:888};
 let arr = Array.from({length:12}).map((item,i) => obj[i+1]||'null');
 console.log(arr);
//  222,123,null,null,888,null,null,null,null,null,null,null

Array.from({length:12})创建一个12个空位的数组
.map()将obj中的每一项赋值给数组

627235655 · 2019-04-16T02:59:49Z

Array.from({1: 222, 2: 123, 5: 888, length: 13}).slice(1).map((v, i) => v || null)

ZhanghaoH · 2019-04-16T03:20:52Z

没用es6数组好low

/**
  * convert
  * @param {*} param 转换的12个月销售额 对象
  */
//  第 55 题：某公司 1 到 12 月份的销售额存在一个对象里面，如下：{1:222, 2:123, 5:888}，请把数据处理为如下结构：[222, 123, null, null, 888, null, null, null, null, null, null, null]。

function convert(param) {
  if (typeof param === 'object' && param) {
    let arr = new Array(13);
    for (let index = 0; index < arr.length; index++) {
      let e = param[key] : null;
      arr[index] = e;
    }
    return arr.slice(1);
  } else {
    console.warn('输入不合理！');
    return;
  }
}

const obj = { 1: 222, 2: 123, 5: 888 };
let convertArr = convert(obj);
console.log(convertArr);

bran-nie · 2019-04-16T03:38:52Z

let data = {1:222, 2:123, 5: 888}

let r = Array(12).fill(null)
r.forEach((v, i, arr) => {
    data[i] && (arr[i - 1] = data[i])
})
console.log(r)

xbcc123 · 2019-04-16T05:40:17Z

   const obj = { 1: 222, 2: 123, 5: 888 }
    const vali = (options) => {
        if (Object.prototype.toString.call(options) !== '[object Object]') {
            console.log('请传入对象')
            return false
        }
        return true
    }
    const getSale = (options) => {
        if (!vali(options)) {
            return
        }
        let arr = new Array(13)
        for (let i = 0; i < arr.length; i++) {
            arr[i] = null
            Object.keys(options).forEach(it => {
                if (parseInt(it) === i) {
                    arr[i] = options[it]
                }
            })
        }
        arr.shift()
        return arr
    }
    console.log(getSale(obj))

    // ES6
    const objToArr = (options) => {
        if (!vali(options)) {
            return
        }
        options = { ...options, length: 13 }
        let arr = Array.from(options);
        arr.shift()
        arr = arr.map(item => {
            if (item === undefined) {
                return item = null
            } else {
                return item
            }
        })
        return arr
    }
    console.log(objToArr(obj))

写的好low

BaconZhang · 2019-04-16T06:52:02Z

    let result = Object.entries({ 1: 222, 2: 123, 5: 888 }).reduce(
        (prev, [key, value]) => { prev[key - 1] = value; return prev; },
        Array.from( { length: 12 }, (_) => null )
    );
    console.log(result);

NANAYWY · 2019-04-16T07:18:15Z

  Object.assign(Array(13).fill(null),{1:222, 2:123, 5:888}).slice(1)

baobaoblue · 2019-04-16T08:46:38Z

function newData(obj){
obj.length = 12
let newObj = Array.from(obj).map((item,index) =>obj[index+1] || null)
return newObj;
}
console.log(newData({1:222, 2:123, 5:888}))

un-defined · 2019-04-16T09:21:19Z

var format = function(sales) {
var arr = new Array(12).fill(null);
for (const month in sales) arr[month - 1] = sales[month];
return arr;
}

MKLM0222 · 2019-04-16T16:03:27Z

function objectToArray(object) {
var arr=new Array(12).fill(null)
var newArr=arr.map((x,index) => {
if(object[index+1]){
return object[index+1]
}else{
return null
}
})
return newArr
}

pengcc · 2019-04-16T17:35:35Z

回答好踊跃，贴上自己的，其实使用的方法在上边都已经有了。感觉不同的方法的区别就是会使用到不同数量的新生成数组，另外代码量也不同，可以根据个人口味选择。

const DATA = {1: 500, 3: 800, 5: 2000};
// const TARGET = [500, null, 800, null, 2000, null, null, null, null, null, null, null];

/** create three arrays */
const transformObjToArrayES6SliceMap = (obj) => Array.from(Object.assign({}, obj, { length: 13 })).slice(1).map((item) => item || null);

/** create one array */
const transformObjToArrayES6ForEach = (obj) => { 
       const arr = Array.from({ length: 12 }); 
       arr.forEach((item, index, arr) => { arr[index] = obj[index+1] || null;}); 
       return arr;
};

/** create two arrays */
const transformObjToArrayES6Map = (obj) => Array.from({ length: 12 }).map((item, index) => obj[index+1] || null);

/** create one array */
const transformObjToArrayFor = (obj) => {
	let arr = [];
	for (let i=0; i < 12; i++) {
		arr[i] = obj[i+1] || null;
	}
	return arr;
};

ysyfff · 2020-12-23T03:12:30Z

let transfer = (obj)=> new Array(12).fill(null).map((item,i)=>(obj[i+1]||item))

transfer({1:222, 2:123, 5:888})

liyang1994 · 2021-01-05T08:20:09Z

var a = {1:222, 2:123, 5:888}
var b = []
for( var i = 1;i<= 12;i++){
b[i-1] = a[i] ? a[i] : null
}
console.log(b)

chdongq · 2021-01-19T09:40:04Z

let obj = {1:222, 2:123, 5:888};
obj.length=12;
let newObj = Array.from(obj).map((item,index)=>obj[index+1]||null)

pan-Z2l0aHVi · 2021-01-26T10:16:02Z

function dataTransform(object) {
  return Array.from(Array(12)).map((item, index) => {
    let result = null
    Object.keys(object).forEach((key) => {
      if (key === String(index + 1)) {
        result = object[key]
      }
    })
    return result
  })
}

ViolaSong123 · 2021-01-27T09:19:07Z

var arr = new Array(12).fill(null),
obj = { 1: 222, 2: 123, 5: 888 };
for (key in obj) {
arr[key-1] = obj[key]
}
console.log(arr)

orime · 2021-01-28T13:44:41Z

```js
let obj = {1:222, 2:123, 5:888};
const result = Array.from({ length: 12 }).map((_, index) => obj[index + 1] || null);
console.log(result)

如果其中一个月份销售额为0就不行了

let obj = {1:222, 2:123, 5:888, 4: 0};
const result = Array.from({ length: 12 }).map((_, index) => obj[index + 1] || null);
console.log(result)

manyyuri · 2021-01-31T09:45:47Z

function toRe(obj) {
  let re = [];
  for (let i = 1; i < 13; i++) {
    // 遍历1-12，出现在给定对象中则赋对应值，否则置为null;
    re[i - 1] = i in obj ? obj[i] : null;
  }
  return re;
}
console.log(toRe({ 1: 222, 2: 123, 5: 888 }));

Mochalhy · 2021-03-23T12:29:58Z

const obj = {
1: 222,
2: 123,
5: 888
};
const newArr = [...new Array(12)].map((item, index) => obj.hasOwnProperty(index+1) ? obj[index+1] : null);

peterczg · 2021-05-04T05:26:28Z

Object.assign(new Array(13).fill(null),{1:222, 2:123, 5:888}).slice(1)

ruanlinxin · 2021-05-05T11:21:03Z

const data = {1:222, 2:123, 5:888}
const map = new Array(12).fill(null)
console.log(map.map((item,i)=> data[i+1] || item))
```

zhelingwang · 2021-05-10T02:08:29Z

let data = { 1: 222, 2: 123, 5: 888 };
let arr = new Array(12).fill(null);
Object.keys(data).forEach(month => {
  arr[month - 1] = data[month];
});
console.log(arr);

tchen-l · 2021-06-10T07:09:20Z

let obj = {1:222, 2:123, 5:888};
const result = Array.from({ length: 12 }).map((_, index) => obj[index + 1] || null);
console.log(result)

这个 || 要换成 ?? 吧

Nicholas-Ke · 2021-09-22T17:17:35Z

let obj = {1:222, 2:123, 5:888};
let arr = new Array(12).fill(null);
for (const [k, v] of Object.entries(obj)) {
arr[k - 1] = v;
}

dogfeeling · 2021-09-26T03:44:23Z

const obj = {1:222, 2:123, 5:888}

let res = new Array(12).fill(null).map((item,index)=>(item=obj[index+1] || null,item))

console.log(res);
看了一下你们的代码确实比我简洁，学习了

xiangfei1 · 2021-10-13T07:12:50Z

 let obj = {
    1:222,
    2:123,
    5:888
}
let arr = new Array(12).fill(null);
for(let i in obj){
 arr.splice(i-1,1,obj[i]);
}
console.log(arr);

SnailOwO · 2021-12-16T08:14:02Z

   let obj = {
        1: 222,
        2: 123,
        5: 888,
        length: 12
    }
    Array.from(obj).slice(1).map(item => !item ? null : item)

rongda · 2021-12-16T08:14:25Z

你好，我已经收到你的来信！

catwatermelon · 2021-12-23T09:15:36Z

let o = { 1: 222, 2: 123, 5: 888 };
let arr = new Array(12).fill(null);
Object.entries(o).map(([key, value]) => {
arr[key] = value;
})

ghost · 2021-12-27T08:12:04Z

let target = {1:222, 2:123, 5:888}
let res = Array(12).fill(null).map((el,index)=>{
el = target[index+1] ? target[index+1] : null
return el
})

AwangXuan · 2022-03-09T08:20:12Z

	let sele = { 1: 222, 2: 123, 5: 888 }
	function tansformSele(obj) {
		let res = [null, null, null, null, null, null, null, null, null, null, null, null]
		for (const [key, value] of Object.entries(obj)) {
			res[key - 1] = value
		}
		return res
	}

	sele = tansformSele(sele)
	console.log("结果:", sele); // (12) [222, 123, null, null, 888, null, null, null, null, null, null, null]

rongda · 2022-03-09T08:20:35Z

你好，我已经收到你的来信！

russwest-dty · 2022-04-10T08:14:03Z

    function insert(obj){
        let arr = new Array(12).fill(null)
        for(let i in obj){
            arr[i-1] = obj[i]
        }
        return arr
    }

guzao · 2022-07-11T06:04:05Z

export function objectToArr (data: Record<string, number>): Array<any> {
  const result = new Array(12).fill(null)
  Object.keys(data).forEach((key: string) => result[+key - 1 ] = data[key])
  return result
}

Lxming1 · 2022-08-07T12:49:58Z

const mount = {
1: 222,
2: 123,
5: 888
}
const arr = Array.from({length: 12}, (item, index) => mount[index+1] ?? null)
console.log(arr)

benzhemin · 2023-02-19T12:32:31Z

const transformSale = sales => {
    const monthsList = Array.from({length: 12}).map((_, index) => index+1);
    return monthsList.map(month => sales[month] ?? null)
}

const monthSalesTarget = {1: 222, 2: 123, 5: 888}

const monthSaleList = transformSale(monthSalesTarget);
console.log(monthSaleList);

rongda · 2023-02-19T12:32:56Z

你好，我已经收到你的来信！

laoer536 · 2023-02-21T09:53:55Z

const base = { 1: 222, 2: 123, 5: 888 }
const newArray2 = Array.from(Array(12), (item, index) => [index + 1, null])
const resObj = { ...Object.fromEntries(newArray2), ...base }
const objValues = Object.values(resObj)
console.log(objValues)

chenzhengduan · 2024-05-30T08:39:31Z

const data={1:222, 2:123, 5:888}; let newArr=new Array(12).fill(null); for(item in data){ newArr[item-1]=data[item] } console.log(newArr) //[222, 123, null, null, 888, null, null, null, null, null, null, null]

rongda · 2024-05-30T08:40:04Z

你好，我已经收到你的来信！

chenzhengduan · 2024-05-30T08:41:07Z

const data={1:222, 2:123, 5:888};
let newArr=new Array(12).fill(null);
for(item in data){
newArr[item-1]=data[item]
}
console.log(newArr)
// [222, 123, null, null, 888, null, null, null, null, null, null, null]

第 55 题：某公司 1 到 12 月份的销售额存在一个对象里面 #96

第 55 题：某公司 1 到 12 月份的销售额存在一个对象里面 #96

Comments

zeroone001 commented Apr 15, 2019 • edited Loading

wangming-0215 commented Apr 16, 2019

vivvn commented Apr 16, 2019

vivvn commented Apr 16, 2019

vivvn commented Apr 16, 2019

Seasonley commented Apr 16, 2019 • edited Loading

Moriarty02 commented Apr 16, 2019

WQHASH commented Apr 16, 2019 • edited Loading

MaJiaXuan commented Apr 16, 2019

truexin1292 commented Apr 16, 2019

Yanhua67 commented Apr 16, 2019

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vivvn commented Apr 16, 2019

lxinr commented Apr 16, 2019

ZodiacSyndicate commented Apr 16, 2019

NANAYWY commented Apr 16, 2019

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zxcweb commented Apr 16, 2019

zo11o commented Apr 16, 2019

lvwxx commented Apr 16, 2019

mandyshen97 commented Apr 16, 2019

627235655 commented Apr 16, 2019

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xbcc123 commented Apr 16, 2019

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