Collect.js sum() Method

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The sum() method in collect.js is used to return the sum of all the items in the given collection.

Syntax:

collect(array).sum()

Parameters: The collect() method takes one argument that is converted into the collection and then sum() method is applied on it.

Return Value: This method returns the sum of all items in the collection:

The below examples illustrates the sum() method in collect.js:

Example 1:

Javascript

// Acquiring collect.js constant 
const collect = require('collect.js');  
     
let arr = [5, 10, 12, 15, 18]  
     
const collection = collect(arr); 
  
const find_sum = collection.sum();  
  
console.log(find_sum);

Output:

Example 2:

Javascript

// Acquiring collect.js constant 
const collect = require('collect.js');  
     
let obj = [  
    {  
        subject: 'English',  
        score: 85,  
    },  
   {  
        subject: 'math',  
        score: 90,  
    }, 
    {  
        subject: 'science',  
        score: 98,  
    } 
];  
    
const collection = collect(obj);  
  
const find_sum = collection.sum('score');  
  
console.log(find_sum);

Output:

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