decentraland-experiments

🛠 Experiment Tracking Tool (A/B Testing)

Implemented from RFC (#54)

Index

• Installation
• Usage
  • Vanilla JS
  • React
  • React+Context
• Testing

Installation

  npm install -s decentraland-experiments

Usage

Vanilla JS

Instantiate all experiments

import { Experiments, Experiment, Variant } from 'decentraland-experiments';

const experiments = new Experiments({ avatar_signup_test: ... }, localStorage, analytics)

Retrieve and use the test value

// if there are any test for `avatar_signup_test` it will be activate
const value = experiments.getCurrentValueFor('avatar_signup_test', 'Sing Up')

Track segments events

analytics.track(SIGNUP_EVENT)

React

Instantiate all experiments

import { Experiments, Experiment, Variant } from 'decentraland-experiments';

const experiments = new Experiments({ avatar_signup_test: ... }, localStorage, analytics)

Retrieve and use the test value

import { experiments } from 'path/to/experiments'

export default class SignUpButton extends React.PureComponent<Props, State> {

  render() {
    const text = experiments.getCurrentValueFor('avatar_signup_test', 'avatars.form.signup')
    <Button>{t(text)}</Button>
  }
}

Track segments events

import { experiments } from 'path/to/experiments'

export default class SignUpButton extends React.PureComponent<Props, State> {

  handleClick = (event: React.MouseEvent<HTMLElement>) => {
    // ...
    analytics.track(SIGNUP_EVENT)
  }

  render() {
    const text = experiments.getCurrentValueFor('avatar_signup_test', 'avatars.form.signup')
    <Button onClick={this.handleClick}>{t(text)}</Button>
  }
}

React + Context

Create the new Context without experiments

import { Experiments } from 'decentraland-experiments'

const ExperimentsContext = React.createContext(new Experiments({}))

Instantiate all experiments

import { Experiments, Experiment, Variant } from 'decentraland-experiments';

const experiments = new Experiments({ avatar_signup_test: ... }, localStorage, analytics)

Add Context.Provider to initial render and set the experiments instance as value property

import ExperimentsContext from 'path/to/context'

ReactDOM.render(
  <ExperimentsContext.Provider value={experiments}>
    {/* ... */}
  </ExperimentsContext.Provider>,
  document.getElementById('root')
)

Add Context to the testing element and retrieve the test value

import ExperimentsContext from 'path/to/context';

export default class SignUpButton extends React.PureComponent<Props, State> {

  static contextType = ExperimentsContext

  render() {
    const text = this.context.getCurrentValueFor('avatar_signup_test', 'avatars.form.signup')
    <Button>{t(text)}</Button>
  }
}

Track segments events

import ExperimentsContext from 'path/to/context';

export default class SignUpButton extends React.PureComponent<Props, State> {

  handleClick = (event: React.MouseEvent<HTMLElement>) => {
    // ...
    analytics.track(SIGNUP_EVENT)
  }

  render() {
    const text = this.context.getCurrentValueFor('avatar_signup_test', 'avatars.form.signup')
    <Button>{t(text)}</Button>
  }
}

Testing (with Jest)

Retrieve all values and ensure its types

import { experiments } from 'path/to/experiments'

test(`all experiment value for avatar_signup_test are not empty strings`, () => {
  for (const value of experiments.getAllValuesFor('avatar_signup_test')) {
    expect(typeof value).toBe('string')
    expect(value.length).toBeGreaterThanOrEqual(5)
  }
})