tomatau

const flatten = (source) => {
  const length = source.length
  let i = 0
  let flattened = []

  for (; i < length; i++) {
    // recursive call could reach stack limit
    flattened = flattened.concat(
      !Array.isArray(source[i]) ? source[i] : flatten(source[i])
    )

tomatau

import assert from 'assert'

const sortByAge = (source) => source.sort((itemA, itemB) => itemA.age - itemB.age)

const ob = (age) => ({ name: ''+age, age })

assert.deepEqual(
  sortByAge([ ob(1), ob(6), ob(2), ob(5), ob(3), ob(4) ]),
  [ ob(1), ob(2), ob(3), ob(4), ob(5), ob(6) ]
)

tomatau

import { Switch, Route } from 'react-router'
import { replace } from 'react-router-redux'

@connect(null, { replace })
class PrivateRoute extends React.Component {
  componentWillMount() {
    this.props.replace('/foo')
  }

  render() {