📜  Collect.js mapInto() 方法

📅  最后修改于: 2022-05-13 01:56:42.545000             🧑  作者: Mango

Collect.js mapInto() 方法

mapInto() 方法用于遍历集合元素并以每个元素作为构造函数来实例化给定的类。

句法:

collect(array).mapInto()

参数: collect() 方法采用一个参数,该参数转换为集合,然后对其应用 mapInto() 方法。

返回值:此方法返回映射的集合元素。

下面的示例说明了 collect.js 中的 mapInto() 方法:

示例 1:

Javascript
const collect = require('collect.js');
  
const data = function (name) {
    this.name = name;
};
  
const arr = ['GFG', 'Geeks', 'GeeksforGeeks'];
  
const collection = collect(arr);
  
const elements = collection.mapInto(data);
  
console.log(elements.all());


Javascript
const collect = require('collect.js');
  
const data = function (name, dob) {
    this.name = name;
    this.dob = dob;
};
  
let obj = [
    {
        name: 'Rahul',
        dob: '25-10-96',
        section: 'A',
        score: 98,
    },
    {
        name: 'Aditya',
        dob: '25-10-96',
        section: 'B',
        score: 96,
    },
    {
        name: 'Abhishek',
        dob: '16-08-94',
        section: 'A',
        score: 80
    },
    {
        name: 'Rahul',
        dob: '19-08-96',
        section: 'B',
        score: 77,
    },
];
  
const collection = collect(obj);
  
const objects = collection.mapInto(data);
  
console.log(objects.all());


输出:

[
  data { name: 'GFG' },
  data { name: 'Geeks' },
  data { name: 'GeeksforGeeks' }
]

示例 2:

Javascript

const collect = require('collect.js');
  
const data = function (name, dob) {
    this.name = name;
    this.dob = dob;
};
  
let obj = [
    {
        name: 'Rahul',
        dob: '25-10-96',
        section: 'A',
        score: 98,
    },
    {
        name: 'Aditya',
        dob: '25-10-96',
        section: 'B',
        score: 96,
    },
    {
        name: 'Abhishek',
        dob: '16-08-94',
        section: 'A',
        score: 80
    },
    {
        name: 'Rahul',
        dob: '19-08-96',
        section: 'B',
        score: 77,
    },
];
  
const collection = collect(obj);
  
const objects = collection.mapInto(data);
  
console.log(objects.all());

输出:

[
  data {
    name: { 
      name: 'Rahul', 
      dob: '25-10-96', 
      section: 'A', 
      score: 98 
    },
    dob: 0
  },
  data {
    name: { 
      name: 'Aditya', 
      dob: '25-10-96', 
      section: 'B', 
      score: 96 },
    dob: 1
  },
  data {
    name: { 
      name: 'Abhishek', 
      dob: '16-08-94', 
      section: 'A', 
      score: 80 
    },
    dob: 2
  },
  data {
    name: { 
      name: 'Rahul', 
      dob: '19-08-96', 
      section: 'B', 
      score: 77 
    },
    dob: 3
  }
]