第 55 题：某公司 1 到 12 月份的销售额存在一个对象里面

[zeroone001]

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);

[ktlshya]

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

[vivvn]

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]

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]

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]

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

[Moriarty02]

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

[WQHASH]

function arrToObject(obj) {
let arr = [];
for (let i = 0; i < 12; i++) {
arr.push(null)
for (let key in obj) {
if(key == (i+1)){
arr.splice(i, 1, obj[key])
}
}
}
return arr;
};
let obj = {1:222, 2:123, 5:888};

怎么感觉我这好low啊！！

[MaJiaXuan]

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]

// 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]

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

[GuoYuFu123]

var obj = { 1: 222, 2: 123, 5: 888 };
let arr = [];
for(var 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]

[vivvn]

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

[lxinr]

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]

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]

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);