Collect.js sum() Method

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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