📜  Collect.js flatMap() 方法

📅  最后修改于: 2022-05-13 01:56:39.079000             🧑  作者: Mango

Collect.js flatMap() 方法

Collect.js是一个用于处理数组和对象的包装库,它无依赖且易于使用。 flatMap()方法用于迭代所有集合元素并将每个集合元素传递给给定的回调。

句法:

collect(array).flatMap(callback)

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flatMap()方法。 flatMap()方法拥有一个单参数回调函数。

示例 1:下面的示例说明了collect.js中的flatMap()方法

html
const collect = require('collect.js');
   
let obj = [
    {
        name: 'Rahul',
        score: 98,
    },
    {
        name: 'Aditya',
        score: 96,
    },
    {
        name: 'Abhishek',
        score: 80
    }
];
   
const collection = collect(obj);
   
const map_Val = collection.flatMap(
  element => element.name.toUpperCase());
  
console.log(map_Val.all());


html
const collect = require('collect.js');
   
let obj = [
    {
        name: 'Rahul',
        score: 98,
    },
    {
        name: 'Aditya',
        score: 96,
    },
    {
        name: 'Abhishek',
        score: 80
    },
    {
        name: 'Rahul',
        score: 77,
    },
];
   
const collection = collect(obj);
   
const map_Val = collection.flatMap(
  element => element.score > 80);
  
console.log(map_Val.all());


输出:

[ 'RAHUL', 'ADITYA', 'ABHISHEK' ]

示例 2:

html

const collect = require('collect.js');
   
let obj = [
    {
        name: 'Rahul',
        score: 98,
    },
    {
        name: 'Aditya',
        score: 96,
    },
    {
        name: 'Abhishek',
        score: 80
    },
    {
        name: 'Rahul',
        score: 77,
    },
];
   
const collection = collect(obj);
   
const map_Val = collection.flatMap(
  element => element.score > 80);
  
console.log(map_Val.all());

输出:

[ true, true, false, false ]