Avoid Math.max.apply

[allevo]

getChild is hot code.

$ node benchMax.js 
Math.max.apply(Math, arr) x 26,094,752 ops/sec ±3.09% (86 runs sampled)
getMax(arr) x 82,660,189 ops/sec ±5.21% (80 runs sampled)

'use strict'

const Benchmark = require('benchmark')
const suite = Benchmark.Suite()

const arr = [1, 5, 2, 7, 3]

function getMax (arr) {
  var l = arr.length
  var max = arr[0]
  for (var i = 1; i < l; i++) {
    if (arr[i] > max) {
      max = arr[i]
    }
  }
  return max
}

suite
  .add('Math.max.apply(Math, arr)', function () {
    Math.max.apply(Math, arr)
  })
  .add('getMax(arr)', function () {
    getMax(arr)
  })
  .on('cycle', function (event) {
    console.log(String(event.target))
  })
  .on('complete', function () {})
  .run()

[delvedor]

Awesome!