Kumite

Start a new Kumite

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.

ThomasCampbell1988vs.Kacarott

Powerful Arrays

Code

Diff

// split out previous solution so I could better understand it

function* powerfulGen(n) {
  let i = 0;
  while (++i<n) {
    let binaryString = i.toString(2); // convert i to binary
    let binaryResult = binaryString.substring(binaryString.lastIndexOf("1")); // Only want from last index of 1, eg 1010 => 10
    yield parseInt(binaryResult, 2); // convert back to base10 and yeild
  }
}

const powerfulArray = n => [...powerfulGen(2**n)];

- // split out previous solution so I could better understand it
- function* powerfulGen(n) {
- let i = 0;
- ~~while (++i<n) yield parseInt(i.toString(2).match(/10*$/), 2);~~
- while (++i<n) {
- let binaryString = i.toString(2); // convert i to binary
- let binaryResult = binaryString.substring(binaryString.lastIndexOf("1")); // Only want from last index of 1, eg 1010 => 10
- yield parseInt(binaryResult, 2); // convert back to base10 and yeild
- }
- }
- const powerfulArray = n => [...powerfulGen(2**n)];

eurydice5717vs.eurydice5717

Palindrome

Fundamentals

Strings

Data Types

Algorithms

Logic

Code

Diff

#include <string>
#include <algorithm>
bool isPalindrome(const std::string &word) {
  return std::equal(word.cbegin(),word.cbegin() + word.size()/2, word.crbegin());
}

- #include <string>
- #include <algorithm>
- bool isPalindrome(const std::string &word) {
- ~~return std::string{word.rbegin(),word.rend()}==word;~~
- return std::equal(word.cbegin(),word.cbegin() + word.size()/2, word.crbegin());
- }

user6707459vs.floppy_

Print Statements

Code

Diff

Print_Statements = lambda: print('Hello Mark!\nThis is my first python script.\nPython will be fun to learn!\nI am not at COGS, I am at home in my jammies.\nAni Morrow\'s script has ended...have a great semester!')

- def Print_Statements():
- ~~print('Hello Mark!~~
- ~~This is my first python script.~~
- ~~Python will be fun to learn!~~
- ~~I am not at COGS, I am at home in my jammies.~~
- ~~Ani Morrow\'s script has ended...have a great semester!')~~
- Print_Statements = lambda: print('Hello Mark!
- This is my first python script.
- Python will be fun to learn!
- I am not at COGS, I am at home in my jammies.
- Ani Morrow\'s script has ended...have a great semester!')

Zwerrugavs.flaschracket

Vowels at sentence

Code

Diff

const countVowel = s => s.match(/[aeiou]/gi)?.length | 0

- ~~const countVowel = s => (s.match(/[aeiou]/ig) || []).length~~
- const countVowel = s => s.match(/[aeiou]/gi)?.length | 0

Test Cases

Diff

const chai = require("chai");
const assert = chai.assert;

describe("Solution", function () {
  it("should return number", function () {
    assert.strictEqual(typeof countVowel("A"), "number");
    assert.strictEqual(typeof countVowel(""), "number");
  });

  it("should not return NaN in string without vowels", function () {
    assert.strictEqual(countVowel(""), 0);
  });

  it("should test for fixed string", function () {
    assert.strictEqual(countVowel("Vowels at sentence"), 6);
    assert.strictEqual(
      countVowel(
        "Autronica is a leading innovator, manufacturer and supplier of fire and gas safety worldwide."
      ),
      33
    );
  });
});

const getRandomNum = (min, max) =>
  Math.floor(Math.random() * (max - min + 1)) + min;

const vowels = new Set([..."AEIOUaeiou"]);

const getRandomTestOptions = () => {
  const stringLength = getRandomNum(1, 100);

  let vowelsCount = 0;
  let resultString = "";

  for (let i = 0; i < stringLength; i++) {
    const newSymbol = String.fromCharCode(getRandomNum(0, 300));
    resultString += newSymbol;
    vowelsCount += +vowels.has(newSymbol);
  }

  return [resultString, vowelsCount];
};

describe("Random Test", function () {
  it("100 random test", function () {
    for (let i = 0; i < 100; i++) {
      const testOptions = getRandomTestOptions();
      assert.strictEqual(countVowel(testOptions[0]), testOptions[1]);
    }
  });
});

- ~~// Since Node 10, we're using Mocha.~~
- ~~// You can use `chai` for assertions.~~
- const chai = require("chai");
- const assert = chai.assert;
- // Uncomment the following line to disable truncating failure messages for deep equals, do:
- ~~// chai.config.truncateThreshold = 0;~~
- // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
- // Uncomment the following to use the old assertions:
- ~~// const Test = require("@codewars/test-compat");~~
- ~~describe("Solution", function() {~~
- ~~it("should test for something", function() {~~
- ~~// Test.assertEquals(1 + 1, 2);~~
- ~~assert.strictEqual(countVowel("Vowels at sentence"), 6);~~
- assert.strictEqual(countVowel("Autronica is a leading innovator, manufacturer and supplier of fire and gas safety worldwide."), 33);
- describe("Solution", function () {
- it("should return number", function () {
- assert.strictEqual(typeof countVowel("A"), "number");
- assert.strictEqual(typeof countVowel(""), "number");
- });
- it("should not return NaN in string without vowels", function () {
- assert.strictEqual(countVowel(""), 0);
- });
- it("should test for fixed string", function () {
- assert.strictEqual(countVowel("Vowels at sentence"), 6);
- assert.strictEqual(
- countVowel(
- "Autronica is a leading innovator, manufacturer and supplier of fire and gas safety worldwide."
- ),
- 33
- );
- });
- });
- const getRandomNum = (min, max) =>
- Math.floor(Math.random() * (max - min + 1)) + min;
- const vowels = new Set([..."AEIOUaeiou"]);
- const getRandomTestOptions = () => {
- const stringLength = getRandomNum(1, 100);
- let vowelsCount = 0;
- let resultString = "";
- for (let i = 0; i < stringLength; i++) {
- const newSymbol = String.fromCharCode(getRandomNum(0, 300));
- resultString += newSymbol;
- vowelsCount += +vowels.has(newSymbol);
- }
- return [resultString, vowelsCount];
- };
- describe("Random Test", function () {
- it("100 random test", function () {
- for (let i = 0; i < 100; i++) {
- const testOptions = getRandomTestOptions();
- assert.strictEqual(countVowel(testOptions[0]), testOptions[1]);
- }
- });
- });

flaschracketvs.flaschracket

Check Even Number

no need to write values in hexa. now is more readable

Code

Diff

isEven = _0x55bac8 => _0x55bac8 % 2 == 0 ;

- ~~isEven = _0x55bac8 => _0x55bac8 % 0x2 === 0x0 ;~~
- isEven = _0x55bac8 => _0x55bac8 % 2 == 0 ;

flaschracketvs.flaschracket

[C#] The default value of a field of a reference type is null, but not local variable

the default value of a string is always null.
the variables in method are local and they will be not used anyway.

Code

Diff

namespace Test {
  public class Test {
    public string a, b;
    
    public bool DummyMethod() 
    {  
      return true;      
    }
    
  }
}

- namespace Test {
- public class Test {
- public string a, b;
- public bool DummyMethod()
- {
- ~~string local_a = default;~~
- ~~return local_a ==null;~~
- return true;
- }
- }
- }

Freestyle Sparring

Powerful Arrays

Palindrome

Print Statements

Vowels at sentence

Check Even Number

[C#] The default value of a field of a reference type is null, but not local variable

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Freestyle Sparring

Powerful Arrays

Palindrome

Print Statements

Vowels at sentence

Check Even Number

[C#] The default value of a field of a reference type is null, but not local variable

Confirm

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