sum-by

Sum the elements of an array with an optional iteratee function

Install

npm install sum-by

This module can be used for Node.js as well as browsers using Browserify.

Usage

const _sum = require('sum-by')
 
_sum([1, 2, 3])
// => 6
 
_sum([1, undefined, 3])
// => 4
 
_sum([{foo: 1}, {foo: 2}, {foo: 3}], (x) => x.foo)
// => 6
 
_sum([{foo: 1}, {bar: 2}, {foo: 3}], (x) => x.bar)
// => 2
 
_sum([{foo: 1}, {bar: 2}, {foo: 3}], (x) => x.herp)
// => 0

Tests

npm test

Benchmark

npm run benchmark

	Size (uglify + gzip)	Performance	Performance (with iteratee)
sum-by	148 bytes	56,339,337 ops/sec	31,280,534 ops/sec
lodash.sumby	5,233 bytes	53,324,787 ops/sec	16,245,337 ops/sec

Licence

MIT