如何在javascript中将数组作为对象传递？

Question

我可以通过这种方式传递数组的值及其工作原理const obj = [  { text1: "John", text2: "male" },  { text1: "Philip", text2: "male" },  { text1: "Matthew", text2: "male" },  { text1: "Richard", text2: "male" }, ];但我需要这样传递var obj = {    text1: ["John", "Philip", "Matthew", "Richard"],    text2: ["male", "male", "male", "male"]};

Answer 1

您可能想按键对值进行分组

1. 使用forEach循环遍历每个项目input

2. 在每个项目中尝试收集属于该项目的所有键的名称

3. 使用for...loop每个键的名称并检查是否obj[k]为空，然后我们必须分配一个空数组并将此 key( ) 的值推k入obj[k]。

这就是解决方案

    const input = [

      {text1: 'John', text2: 'male'},

      {text1: 'Philip', text2: 'male'},

      {text1: 'Matthew', text2: 'male'},

      {text1: 'Richard', text2: 'male'},

    ];

    function toKeyArray(array) {

      const obj = {};

      array.forEach(item => {

        const keys = Object.keys(item);

        for (const k of keys) {

          (obj[k] = obj[k] || []).push(item[k]);

        }

      });

      return obj;

    }

    const output = toKeyArray(input);

    console.log(output);

Answer 2

我们可以使用Array.reduce和实现这一点Object.entries

const obj = [{text1:"John",text2:"male"},{text1:"Philip",text2:"male"},{text1:"Matthew",text2:"male"},{text1:"Richard",text2:"male"},]

const formatData = (data) => data.reduce((res, obj) => {

  Object.entries(obj).forEach(([key, val]) => {

    res[key] = [...(res[key] || []), val];

  });

  return res;

}, {});

console.log(formatData(obj));

.as-console-wrapper {

  max-height: 100% !important;

}

Answer 3

const input = [

  { text1: "John", text2: "male" },

  { text1: "Philip", text2: "male" },

  { text1: "Matthew", text2: "male" },

  { text1: "Richard", text2: "male" },

 ];

const output = {

    text1: input.map( e => e.text1 ),

    text2: input.map( e => e.text2 )

};

Answer 4

const obj = [{

    text1: "John",

    text2: "male"

  },

  {

    text1: "Philip",

    text2: "male"

  },

  {

    text1: "Matthew",

    text2: "male"

  },

  {

    text1: "Richard",

    text2: "male"

  },

];

var output = {}

obj.forEach(item => {

  Object.keys(item).forEach(key => {

    if (!output[key]) output[key] = [];

    output[key].push(item[key])

  })

})

console.log(output);

Answer 5

使用Array.prototype.reduce，这可以简单地完成。

const obj = [

  { text1: "John", text2: "male" },

  { text1: "Philip", text2: "male" },

  { text1: "Matthew", text2: "male" },

  { text1: "Richard", text2: "male" },

];

const output = obj.reduce((acc, cur) => {

  Object.keys(cur).forEach((item) => {

    acc[item] ? acc[item].push(cur[item]) : acc[item] = [ cur[item] ];

  });

  return acc;

}, {});

console.log(output);