如何将数组 object 转换为 two-dimensional 数组

Question

这是一个数组列表。


const list = [
  {
    id: 5844,
    option: 'fruit'
    children: ['apple', 'banana', 'pear']
  },
  {
   id: 5845,
   option: 'vegetables'
   children: ['tomato', 'potato', 'spinach']
  }
]

我想得到一个这样的新数组

apple of fruit 的 children 是索引 0

蔬菜的番茄 children 是索引 = 0

所以他们匹配

[['apple', 'tomato'], ['banana', 'potato'], ['pear', 'spinach']]

Answer 1

我假设您的 children 长度相同。我们可以使用2个循环来对children.

的元素进行分组

首先循环迭代children的元素。

第二次循环迭代列表的元素。

这是解决您的问题的简单代码。

var listSize = list.length;
var childSize = list[0].children.length;
var expectedArrs = [];
for(var i=0;i<childSize;i++){
  var groupByChild = [];
  for(var j=0;j<listSize;j++){
     groupByChild.push(list[j].children[i]);
  }
  expectedArrs.push(groupByChild);
}
console.log(expectedArrs);

控制台结果：

[["apple", "tomato"], ["banana", "potato"], ["pear", "spinach"]]

Answer 2

已解决：

const result = []
for(let i = 0; i< List[0].children; i++){
const result1 = []
result1.push(list[0].children[i] )
result1.push(list[1].children[i])

result.push(result1)
}

Answer 3

我想我们可以试试这段代码

const list = [
  {
    id: 5844,
    option: 'fruit',
    children: ['apple', 'banana', 'pear']
  },
  {
    id: 5845,
    option: 'vegetables',
    children: ['tomato', 'potato', 'spinach']
  }
]

var ans = []
list.forEach(item => {

  item.children.forEach((child, index) => {

    if (!ans[index]) {
      ans[index] = []
      ans[index].push(child)
    } else {

      ans[index].push(child)
    }
  })

})

Answer 4

  var list = [
  {
    id: 5844,
    option: 'fruit',
    children: ['apple', 'banana', 'pear']
  },
  {
   id: 5845,
   option: 'vegetables',
   children: ['tomato', 'potato', 'spinach']
  }
]
    
  var newArr = [];
  var i=0;
while(i<list.length){
    newArr.push(list[i].children);
    i=i+1;
}

console.log(newArr)

Answer 5

使用此解决方案，数组中有多少对象并不重要。您可以 map over the children in the first object and use it's length to return a flatMap 个子元素。

const list=[{id:5844,option:"fruit",children:["apple","banana","pear"]},{id:5845,option:"vegetables",children:["tomato","potato","spinach"]},{id:5846,option:"buildings",children:["church","warehouse","skyscraper"]}];

function getNewData(list) {

  // `map` over the children in the first object
  // using its index to return a new flattened array
  // of all array object children
  return list[0].children.map((_, i) => {
    return list.flatMap(obj => obj.children[i]);
  });
}

console.log(getNewData(list));

如何将数组 object 转换为 two-dimensional 数组

How do I convert an array object into a two-dimensional array

javascript

algorithm

data-structures