The same file in an xstream implementation using CycleJS (12.2.2):

import {div, button} from '@cycle/dom'

function Clicker ({DOM}) {
  const click$ = DOM.select('button').events('click')
  const count$ = click$.mapTo(1).startWith(3).fold((acc, seed) => (acc || 0) + seed)
  return {
    DOM: count$.map(count => div([
      div([count + ' bottles of beer on the wall']),
      button(['Buy more'])
    ]))
  }
}

export default Clicker

The same file in a JavaScript implementation using Angular (2.4.9):

import {Component} from '@angular/core'

let Clicker = Component({
  selector: '#app',
  template: `
    <p>{{count}} bottles of beer on the wall</p>
    <button (click)="more()">Buy more</button>
  `
}).Class({
  constructor: function () {
    this.count = 3
  },
  more () {
    this.count++
  }
})

export default Clicker

The same file in a TypeScript implementation using Angular (2.4.9):

import {Component} from '@angular/core';

@Component({
  selector: '#app',
  template: `
    <p>{{count}} bottles of beer on the wall</p>
    <button (click)="more()">Buy more</button>
  `
})
export class Clicker {
  count = 3
  more() {
    this.count++
  }
}

The same file in a component w/ class implementation using AngularJS (1.6.1):

import angular from 'angular'

angular.module('clickerapp')
  .component('clicker', {
    template: `
      <p>{{$ctrl.count}} bottles of beer on the wall</p>
      <button ng-click="$ctrl.more()">Buy more</button>
    `,
    controller: class Clicker {
      $onInit () {
        this.count = 3
      }
      more () {
        this.count = this.count + 1
      }
    }
  })

The same file in a component w/ ctrl implementation using AngularJS (1.5.8):

import angular from 'angular'

angular.module('clickerapp')
  .component('clicker', {
    template: `
      <p>{{$ctrl.count}} bottles of beer on the wall</p>
      <button ng-click="$ctrl.more()">Buy more</button>
    `,
    controller: function () {
      this.count = 3
      this.more = () => this.count++
    }
  })

The same file in a component w/o ctrl implementation using AngularJS (1.5.8):

import angular from 'angular'

angular.module('clickerapp')
  .controller('clickerctrl', function () {
    this.count = 3
    this.more = () => this.count++
  })
  .component('clicker', {
    template: `
      <p>{{$ctrl.count}} bottles of beer on the wall</p>
      <button ng-click="$ctrl.more()">Buy more</button>
    `,
    controller: 'clickerctrl'
  })

The same file in a controller implementation using AngularJS (1.5.8):

import angular from 'angular'

angular.module('clickerapp')
  .controller('clicker', ['$scope', function ($scope) {
    $scope.count = 3
    $scope.more = () => $scope.count++
  }])

The same file in a controller as implementation using AngularJS (1.5.8):

import angular from 'angular'

angular.module('clickerapp')
  .controller('clicker', function () {
    this.count = 3
    this.more = () => this.count++
  })

The same file in a directive implementation using AngularJS (1.5.8):

import angular from 'angular'

angular.module('clickerapp')
  .directive('clicker', function () {
    return {
      restrict: 'E',
      template: `
        <p>{{count}} bottles of beer on the wall</p>
        <button ng-click="more()">Buy more</button>
      `,
      link: function (scope) {
        scope.count = 3
        scope.more = () => scope.count++
      }
    }
  })

The same file in a vanilla implementation using Choo (4.1.0):

const html = require('choo/html')

const model = {
  state: { count: 3 },
  reducers: {
    buyMore: (state, data) => ({ count: state.count + 1 })
  }
}

const view = (state, prev, send) => html`
  <main>
    <p>${state.count} bottles of beer on the wall</p>
    <button onclick=${e => send('buyMore')}>Buy more</button>
  </main>
`

module.exports = {model: model, view: view}

The same file in an es6 implementation using Cyclow (0.2.0):

import {Block} from 'cyclow'

const Counter = () => Block({
  events: {
    init: () => count => 3,
    click: () => count => count + 1
  },
  view: count => ({content: [
    {content: `${count} bottles of beer on the wall`},
    {tag: 'button', on: {click: ['click']}, content: 'Buy more'}
  ]})
})

export default Counter

The same file in a react-elm-components implementation using Elm (0.17.1):

port module Clicker exposing (main)

import Html exposing (div, p, button, text)
import Html.App exposing (beginnerProgram)
import Html.Events exposing (onClick)


main =
    beginnerProgram { model = 3, view = view, update = update }


view model =
    div []
        [ p []
            [ text (toString model)
            , text " bottles of beer on the wall"
            ]
        , button [ onClick Increment ] [ text "Buy more" ]
        ]


type Msg
    = Increment


update : Msg -> number -> number
update msg model =
    case msg of
        Increment ->
            model + 1

The same file in a createClass implementation using React (15.3.1):

import React from 'react'

let Clicker = React.createClass({
  getInitialState: () => ({count: 3}),
  more () {
    this.setState({count: this.state.count + 1})
  },
  render () {
    return <div>
      <p>{this.state.count} bottles of beer on the wall</p>
      <button onClick={this.more}>Buy more</button>
    </div>
  }
})

export default Clicker

The same file in an es6 class implementation using React (15.3.1):

import React from 'react'

class Clicker extends React.Component {
  constructor () {
    super()
    this.state = {count: 3}
    this.more = () => this.setState({count: this.state.count + 1})
  }
  render () {
    return <div>
      <p>{this.state.count} bottles of beer on the wall</p>
      <button onClick={this.more}>Buy more</button>
    </div>
  }
}

export default Clicker

The same file in a recompose implementation using React (15.3.1):

import React from 'react'
import {withState} from 'recompose'

const enhance = withState('count', 'more', 3)
const Clicker = enhance(({count, more}) => (
  <div>
    <p>{count} bottles of beer on the wall</p>
    <button onClick={() => more(n => n + 1)}>Buy more</button>
  </div>
))

export default Clicker

The same file in a vanilla implementation using Vue (1.0.26):

import Vue from 'vue'

Vue.component('clicker', {
  template: `
    <p>{{count}} bottles of beer on the wall</p>
    <button v-on:click="more">Buy more</button>
  `,
  data: () => ({count: 3}),
  methods: {
    more () {
      this.count++
    }
  }
})