Question

我有一个包含对象数组的数组。这是一个例子：

[ [{name: Alex, number: 2}, {name: Bill, number: 3}],  [{name: John, number: 5}, {name: Aston, number: 7}]]

我想创建另一个数组，其中包含上述数组数组的所有对象，如下所示：

[{name: Alex, number: 2}, {name: Bill, number: 3}, {name: John, number: 5}, {name: Aston, number: 7}]

我写了下面的代码：

const productsInfoArray = [];
const productsRecords = customerContacts.map(i => i.products).map(product => {
  product.map(i => productsInfoArray.push(i));
  return productsInfoArray;
});

但是当我console.log(productsRecords)返回一个包含所有信息的数组数组时。问题是此数组包含所需数组的12倍，因为customerContacts长度为12

Answer 1

您可以按spreading将数组展平为Array.concat()：

const data = [ [{name: 'Alex', number: 2}, {name: 'Bill', number: 3}],  [{name: 'John', number: 5}, {name: 'Aston', number: 7}]]

const productsRecords = [].concat(...data)

console.log(productsRecords)

或者使用Array.reduce()和concat用于非常大的数组，因为spread不是堆栈安全的：

const data = [ [{name: 'Alex', number: 2}, {name: 'Bill', number: 3}],  [{name: 'John', number: 5}, {name: 'Aston', number: 7}]]

const productsRecords = data.reduce((r, a) => r.concat(a), [])

console.log(productsRecords)

Answer 2

this problem has been resolved

var arrToConvert = [ [{name: "Alex", number: 2}, {name: "Bill", number: 3}],  [{name: "John", number: 5}, {name: "Aston", number: 7}]]
var newArr = [];


for(var i = 0; i < arrToConvert.length; i++)
{
    newArr = newArr.concat(arrToConvert[i]);
}

console.log(newArr);

Answer 3

var data=[[{name: 'Alex', number: 2}, {name: 'Bill', number: 3}],  [{name: 'John', number: 5}, {name: 'Aston', number: 7}]];
var copy = [];
for(var i=0;i<data.length;i++){
  copy = copy.concat(data[i]);
}
console.log(copy);

Answer 4

如果你想使用更加自我解释的代码，你可以使用传统的方式，以便将来如果你想要添加更复杂的逻辑，那么你很容易修改它。

var inputArray =[ [{name: "Alex", number: 2}, {name: "Bill", number: 3}],  [{name: "John", number: 5}, {name: "Aston", number: 7}]];

var outputArray = [];

//loop over the array or arrays
inputArray.forEach((item)=>{
  //loop over each array inside inputArray
  item.forEach((obj) => {
     //push each individual object in a new array
     outputArray.push(obj);
  });
});

console.log(outputArray);

无法创建对象数组

4 个答案: