sum-by
Sum the elements of an array with an optional iteratee function
Install
npm install sum-byThis 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)
// => 0Tests
npm testBenchmark
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
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