Start a new Kumite
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Kumite (ko͞omiˌtā) is the practice of taking techniques learned from Kata and applying them through the act of freestyle sparring.

You can create a new kumite by providing some initial code and optionally some test cases. From there other warriors can spar with you, by enhancing, refactoring and translating your code. There is no limit to how many warriors you can spar with.

A great use for kumite is to begin an idea for a kata as one. You can collaborate with other code warriors until you have it right, then you can convert it to a kata.

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Code
Diff
  • function monteCarlo() {
      return new Promise(function (resolve, reject) {
        resolve([{
          titulo: 'UOL - O Melhor conteúdo'
        }]);
      });
    }
    
    async function main() {
    
      // converter para ES6
      await monteCarlo().then(function(response) {
        console.log(response)
      });
      
      return true;
    }
    • function monteCarlo() {
    • return new Promise(function (resolve, reject) {
    • resolve([{
    • titulo: 'UOL - O Melhor conteúdo'
    • }]);
    • });
    • }
    • async function main() {
    • // converter para ES6
    • monteCarlo().then(function(response) {
    • await monteCarlo().then(function(response) {
    • console.log(response)
    • });
    • return true;
    • }
Code
Diff
  • const main = () => {
    
      let a = [1, 2, 3];
      
      let b = [4, 5, 6];
      
      let c = [7, 8, 9];
    
      // converter para ES6
      //var d = a.concat(b).concat(c);
      var d = [...a,...b,...c];
      return d.join(',');
    }
    • const main = () => {
    • let a = [1, 2, 3];
    • let b = [4, 5, 6];
    • let c = [7, 8, 9];
    • // converter para ES6
    • var d = a.concat(b).concat(c);
    • //var d = a.concat(b).concat(c);
    • var d = [...a,...b,...c];
    • return d.join(',');
    • }
Code
Diff
  • class Component {
      constructor(dom) {
        console.log('Parent class constructor executed!');
        this.dom = dom;
      }
      
      onCreate() {
        return true;
      }
    }
    
    class Collection extends Component {
      constructor(dom) {
        super(dom);    
      }
    }
    • class Component {
    • constructor(dom) {
    • console.log('Parent class constructor executed!');
    • this.dom = dom;
    • }
    • onCreate() {
    • return true;
    • }
    • }
    • class Collection {
    • //
    • class Collection extends Component {
    • constructor(dom) {
    • super(dom);
    • }
    • }
Code
Diff
  • class Component {
      constructor(dom) {
          this.dom = dom;
      }
      
      onCreate() {
        console.log('onCreate from parent class');
        return 'missing';
      }
      
      static on(event, callback) {
        callback();
      }
      
      async emit(event, data) {}
    }
    
    class Title extends Component {
       constructor(dom){
           super(dom)
       }
       
       onCreate() {
         return 'super!'
       }
    }
    
    
    
    • class Component {
    • constructor(dom) {
    • this.dom = dom;
    • }
    • onCreate() {
    • console.log('onCreate from parent class');
    • return 'missing';
    • }
    • static on(event, callback) {
    • callback();
    • }
    • async emit(event, data) {}
    • }
    • class Title extends Component {
    • constructor(dom){
    • super(dom)
    • }
    • onCreate() {
    • return 'super!'
    • }
    • }
Code
Diff
  • {
      function todo() {
        return 'Walk';
      }
      
      // reescrever em ES6
      {
      
        function todo() {
          return 'Run';
        }
      
      }
    }
    
    • function todo() {
    • return 'Walk';
    • }
    • // reescrever em ES6
    • (function() {
    • {
    • function todo() {
    • return 'Run';
    • return 'Walk';
    • }
    • // reescrever em ES6
    • {
    • function todo() {
    • return 'Run';
    • }
    • }
    • })();
    • }
Code
Diff
  • var title = 'UOL - O melhor conteúdo';
    
    var share = {
      fb: {
        title
      },
      twitter: {
        tweet: title
      }
    };
    • var title = 'UOL - O melhor conteúdo';
    • var share = {
    • fb: {
    • title: title
    • title
    • },
    • twitter: {
    • tweet: title
    • }
    • };
Code
Diff
  • const bg = 'gray';
      
    const css = `
    <style>
    body {
      background: ${bg};
      color: black;
    }
    </style>
    `
    • var bg = 'gray';
    • var css = '' +
    • '<style>' +
    • 'body {' +
    • ' background: '+ bg + ';' +
    • ' color: black;'
    • '}' +
    • '</style>';
    • const bg = 'gray';
    • const css = `
    • <style>
    • body {
    • background: ${bg};
    • color: black;
    • }
    • </style>
    • `
Code
Diff
  • // reescreva em ES6
    function main(a, b=2, c=3) {    
        return a * b * c;
    }
    • // reescreva em ES6
    • function main(a, b, c) {
    • if (typeof b == 'undefined')
    • b = 2;
    • if (typeof c == 'undefined')
    • c = 3
    • function main(a, b=2, c=3) {
    • return a * b * c;
    • }
Code
Diff
  • // Exercício 1
    const titulo = "UOL - O melhor conteúdo";
    
    
    // Exercício 2
    const tags = []
    
    tags.push(...['A', 'B']);
    
    
    // Exercício 3
    let descricao = "Em 1999";
    
    descricao += " em São Paulo";
    
    
    // Exercício 4
    const materia = {titulo: "Barão de Limeira"};
    
    materia.titulo = "Alameda " + materia.titulo;
    
    
    // Exercício 5
    for (let i = 10; i--;) {
      console.log(i);
    }
    
    
    // Exercício 6
    for (let tag of ['A', 'B']) {
      console.log(tag);
    }
    
    
    // Exercício 7
    for (var j = [].length; j--;) {}
    
    if (j === -1) {
      console.log('Não encontrei');
    }
    
    
    // Exercício 8
    let a = 123;
    
    {
      a *= 2;
    }
    
    console.log(a);
    
    
    // Exercício 9
    let state = 'active';
    
    function stop() {
      state = 'paused';
    }
    
    stop();
    
    
    // Exercício 10
    const TRUE = !0;
    • // Exercício 1
    • var titulo = "UOL - O melhor conteúdo";
    • const titulo = "UOL - O melhor conteúdo";
    • // Exercício 2
    • var tags = []
    • const tags = []
    • tags.push(...['A', 'B']);
    • // Exercício 3
    • var descricao = "Em 1999";
    • let descricao = "Em 1999";
    • descricao += " em São Paulo";
    • // Exercício 4
    • var materia = {titulo: "Barão de Limeira"};
    • const materia = {titulo: "Barão de Limeira"};
    • materia.titulo = "Alameda " + materia.titulo;
    • // Exercício 5
    • for (var i = 10; i--;) {
    • for (let i = 10; i--;) {
    • console.log(i);
    • }
    • // Exercício 6
    • for (var tag of ['A', 'B']) {
    • for (let tag of ['A', 'B']) {
    • console.log(tag);
    • }
    • // Exercício 7
    • for (var j = [].length; j--;) {}
    • if (j === -1) {
    • console.log('Não encontrei');
    • }
    • // Exercício 8
    • var a = 123;
    • let a = 123;
    • {
    • a *= 2;
    • }
    • console.log(a);
    • // Exercício 9
    • var state = 'active';
    • let state = 'active';
    • function stop() {
    • state = 'paused';
    • }
    • stop();
    • // Exercício 10
    • var TRUE = !0;
    • const TRUE = !0;
Fundamentals
Arrays
Data Types
Code
Diff
  • function getSum(array) {
      return array.reduce((total, num) => total += num);
    }
    • function getSum(array) {
    • //your code
    • return array.reduce((total, num) => total += num);
    • }