Timing of map, reduce, filter

CAH.js

import Game from '../Game'
import cards from './cards'

export default class CAH extends Game {

  static getExpansionsPrettyButDumb () {
    return cards
      .map((card) => card.expansion)
      .filter((expansion, index, arr) => arr.indexOf(expansion) === index)
  }

  static getExpansions () {
    return cards.reduce((acc, card) => {
      if (acc.indexOf(card.expansion) === -1) {
        acc.push(card.expansion)
      }
      return acc
    }, [])
  }

}

testit.js

import CAH from './games/CAH'

console.log('timing first one')
console.time('mapfilter')
for (let i = 0; i < 100; i++) {
  CAH.getExpansionsPrettyButDumb()
}
console.timeEnd('mapfilter')

console.log('timing second one')
console.time('reduce')
for (let i = 0; i < 100; i++) {
  CAH.getExpansions()
}
console.timeEnd('reduce')

// timing first one
// mapfilter: 1309.144ms
// timing second one
// reduce: 14.226ms