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 ]

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