This is a cheat/bot for 10fastfingers.com. Copy and paste into your browser's console when there is a game present and it should just work. Change the targetWpm value and it will try to get as close as possible to it.

10_fast_fingers_cheat.js

class TenFastCheater {
  constructor() {
    const spaceEvent = $.Event('keyup')
    spaceEvent.which = 32
    this.spaceEvent = spaceEvent

    this.adjustmentStep = 50
    this.minDelay = 50
    this.randomRange = 10
    this.targetWpm = 157
    this.charactersTyped = 0
    this.startTime = 0

    this.delay = 1 / (this.targetWpm / 60) * 1000
  }

  static currentWordSelector() {
    return 'span.highlight'
  }

  static inputSelector() {
    return '#inputfield'
  }

  static timerSelector() {
    return '#timer'
  }

  currentWord() {
    return $(this.constructor.currentWordSelector()).text()
  }

  currentWordExists() {
    const word = $(this.constructor.currentWordSelector())
    return word.text() !== "" && word.is(':visible')
  }

  pressSpace() {
    $(this.constructor.inputSelector()).trigger(this.spaceEvent);
  }

  typeWord(word) {
    $(this.constructor.inputSelector()).val(word)
    this.pressSpace()
    // Plus one for the space
    this.charactersTyped += word.length + 1
  }

  typeCurrentWord() {
    this.typeWord(this.currentWord())
  }

  nextTimeout() {
    const randomDelay = (Math.random() * this.randomRange * 2) - this.randomRange
    return this.delay + randomDelay
  }

  currentEstimatedWpm() {
    if (this.secondsElapsed() <= 5) {
      return 0;
    }

    return (60 / (this.secondsElapsed()) * this.charactersTyped) / 5
  }

  secondsElapsed() {
    return ((new Date).getTime() - this.startTime) / 1000
  }

  adjustDelay() {
    if (this.currentEstimatedWpm() == 0) {
      return
    }

    const change = this.adjustmentStep

    if (this.currentEstimatedWpm() > this.targetWpm) {
      this.delay += change
    } else if (this.delay - change >= this.minDelay ) {
      this.delay -= change
    }
  }

  cheat() {
    if (this.startTime == 0) {
      this.startTime = (new Date).getTime()
    }
    this.typeCurrentWord()
    if (!this.currentWordExists()) {
      this.reset()
      return
    }
    this.adjustDelay()
    const nextTimeout = this.nextTimeout()
    setTimeout(this.cheat.bind(this), nextTimeout)
  }

  reset() {
    this.startTime = 0
    this.charactersTyped = 0
  }
}

const cheater = new TenFastCheater
cheater.cheat()