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Collect.js flatMap() Method

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Collect.js is a wrapper library for working with arrays and objects which is dependency-free and easy to use. The flatMap() method is used to iterate all the collection elements and pass each collection elements into given callback.

Syntax:

collect(array).flatMap(callback)

Parameters: The collect() method takes one argument that is converted into the collection and then flatMap() method is applied on it. The flatMap() method holds a single parameter callback function.

Example 1: Below example illustrates the flatMap() method in collect.js

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());


Output:

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

Example 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());


Output:

[ true, true, false, false ]


Last Updated : 25 Nov, 2020
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