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