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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Marcos Adrianovs.moraga

Concatenar listas

Code
Diff
  • const main = () => {
  const a = [1, 2, 3]; 
  const b = [4, 5, 6];
  const c = [7, 8, 9];
  
  return [...a, ...b, ...c].join(',');
}
    • const main = () => {
    • let a = [1, 2, 3];
    • const a = [1, 2, 3];
    • const b = [4, 5, 6];
    • const c = [7, 8, 9];
    • let b = [4, 5, 6];
    • let c = [7, 8, 9];
    • // converter para ES6
    • var d = a.concat(b).concat(c);
    • return d.join(',');
    • return [...a, ...b, ...c].join(',');
    • }
Marcos Adrianovs.moraga

Method shorthand e computed property names

Code
Diff
  • const prop = 'myProp';

var obj = {
  [prop] : 123,
  myFunc() {
    return this[prop];
  }
};
    • // reescreva usando ES6
    • var prop = 'myProp';
    • const prop = 'myProp';
    • var obj = {
    • myFunc: function() {
    • [prop] : 123,
    • myFunc() {
    • return this[prop];
    • }
    • };
    • obj[prop] = 123;
    • }
    • };
hebsonaraujovs.moraga

Sobrescrevendo o constructor da classe base

Code
Diff
  • class Component {
  constructor(dom) {
    console.log('Parent class constructor executed!');
    this.dom = dom;
  }
  
  onCreate() {
    return true;
  }
}

class Collection extends Component {
    constructor(dom,flag){
      super(dom);
      this.flag=flag;
    }
  // 
}
    • class Component {
    • constructor(dom) {
    • console.log('Parent class constructor executed!');
    • this.dom = dom;
    • }
    • onCreate() {
    • return true;
    • }
    • }
    • class Collection {
    • class Collection extends Component {
    • constructor(dom,flag){
    • super(dom);
    • this.flag=flag;
    • }
    • //
    • }
esamaralvs.moraga

Template Literals

Code
Diff
  • var bg = `gray`;

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

Parâmetros opcionais em funções

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;
    • }
xsami

Hello C++

This is a simple example of a hello world in C++

#include <iostream>

int main(){
  
  std::cout << "Hello C++" << endl;
  
}
alantedpowellvs.dealenx

My first hello world kumite

Code
Diff
  • const sum = (a, b) => a + b;
    • function sum(a,b) {
    • return a+b; // wrong returning
    • }
    • const sum = (a, b) => a + b;
an171vs.an171Failed Tests

Сумма нечетных

Разработайте функцию sumNechet (a,b), возвращающую сумму всех нечетных чисел из диапазона от a до b (a < b). Для проверки текущего числа на нечетность создайте функцию нечетное (x)

sumNechet(0, 5) // 9

Code
Diff
  • function нечетное(x) {

}

function sumNechet(a, b) {
 
}
    • function sumNechet(a, b) {
    • function нечетное(x) {
    • }
    • function нечетное(число) {
    • function sumNechet(a, b) {
    • }
kirill303vs.qcarlin

abridged version

Code
Diff
  • function addArr(arr){
  return arr.length?arr.reduce((a,e)=>a + e,0):null;
}
    • function addArr(arr){
    • if(arr.length === 0) return null
    • let final = 0
    • arr.forEach(num => {
    • final += num
    • })
    • return final
    • return arr.length?arr.reduce((a,e)=>a + e,0):null;
    • }