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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dannehdanvs.R3Ked

Is it odd?

Fundamentals
Numbers
Data Types
Integers
Code
Diff
  • class Odd
  def odd(n)
    n % 2 == 1
  end
end
    • public static class Kata
    • {
    • public static bool IsOdd(int input)
    • {
    • return ((input % 10 == 1) || (input % 10 == 3) || (input % 10 == 5) || (input % 10 == 7) || (input % 10 == 9));
    • }
    • }
    • class Odd
    • def odd(n)
    • n % 2 == 1
    • end
    • end
wchrestavs.supercatex

Find the maximum number

Find maximum element of a list in Haskell

Code
Diff
  • module FindMaxNumber where

find_max :: Ord a => [a] -> a
find_max = maximum
    • def find_max(arr):
    • return 0
    • module FindMaxNumber where
    • find_max :: Ord a => [a] -> a
    • find_max = maximum
hadiseidallyvs.ReturnMaster

Return 100

Code
Diff
  • function returnhundred() {
  return Number('Ā'.charCodeAt(0).toString(16));
}
    • function returnhundred() {
    • return 10 ** 2;
    • return Number('Ā'.charCodeAt(0).toString(16));
    • }
Xanhenhavs.moraga

Concatenar listas

Code
Diff
  • const main = () => {

  let a = [1, 2, 3];
  
  let b = [4, 5, 6];
  
  let c = [7, 8, 9];

  // converter para ES6  
  let 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);
    • // converter para ES6
    • let d = [...a, ...b, ...c];
    • return d.join(',');
    • }
victorteixeiravs.moraga

Herdando classes e sobrescrevendo métodos

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 {
  onCreate() {
    super.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 {
    • onCreate() {
    • super.onCreate();
    • return 'super!';
    • }
    • }
hebsonaraujovs.moraga

Criando uma Classe

Code
Diff
  • class Component {
  constructor(dom){
    this.dom = dom;
  }
  
  onCreate() {
    return this.dom;
  }
}

const comp = new Component();
comp.onCreate();
    • function Component(dom) {
    • this.dom = dom;
    • this.onCreate = function() {
    • class Component {
    • constructor(dom){
    • this.dom = dom;
    • }
    • onCreate() {
    • return this.dom;
    • }
    • }
    • }
    • const comp = new Component();
    • comp.onCreate();
rods25vs.moraga

Property Shorthand

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
    • }
    • };
rods25vs.moraga

Deep matching e default values

Code
Diff
  • let results = [
  {materia: {conteudo: {titulo: 'São Paulo'}}, tags: [1, 2, 3]},
  {materia: {conteudo: {}}, tags: [3, 2]},
  {materia: {conteudo: {titulo: 'Rio de Janeiro'}}, tags: [3, 2]},
];

// for (const result of results) {
//   let titulo = result.materia.conteudo.titulo || 'Brasil
  
for (const {materia: {conteudo: {titulo =  'Brasil'}}} of results) { 
  console.log(titulo);
}
    • let results = [
    • {materia: {conteudo: {titulo: 'São Paulo'}}, tags: [1, 2, 3]},
    • {materia: {conteudo: {}}, tags: [3, 2]},
    • {materia: {conteudo: {titulo: 'Rio de Janeiro'}}, tags: [3, 2]},
    • ];
    • for (const result of results) {
    • let titulo = result.materia.conteudo.titulo || 'Brasil';
    • // for (const result of results) {
    • // let titulo = result.materia.conteudo.titulo || 'Brasil
    • for (const {materia: {conteudo: {titulo = 'Brasil'}}} of results) {
    • console.log(titulo);
    • }
denisposevs.moraga

Template Literals

Code
Diff
  • var bg = 'gray';
  
var css = `
  <style>
    body {
      background: ${bg};
      color: black;
    }
  </style>
`;
    • var bg = 'gray';
    • var css = '' +
    • '<style>' +
    • 'body {' +
    • ' background: '+ bg + ';' +
    • ' color: black;'
    • '}' +
    • '</style>';
    • var css = `
    • <style>
    • body {
    • background: ${bg};
    • color: black;
    • }
    • </style>
    • `;