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:

60

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:

273