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.

Anonymous classes new instance

function a(){
  // We shall remove the following solution when publish as KATA
  static $poi = null;
  if ($poi) return $poi->create();
  $poi = new class {
     public function create() {
        return new static();
     }
  };
  return $poi->create();
}

Test Cases

Diff

// PHPUnit Test Examples:
// TODO: Replace examples and use TDD development by writing your own tests
class MyTestCases extends TestCase
{
    // test function names should start with "test"
    public function testSameClassName() {
      $this->assertSame(get_class(a()), get_class(a()));
    }
    public function testAnonymous() {
      $this->assertSame(0, strpos(get_class(a()), "class@anonymous"));
    }
    public function testDifferentIns() {
      $this->assertSame(a() !== a(), true);
    }
}

Recent Moves:

zhujinxuanvs. Iyoo

Anonymous classes new instance

This is a solution of creating multiple instance from the same anoynoumous class.

Code

Diff

function a(){
  static $poi = null;
  if ($poi) return $poi->create();
  $poi = new class {
     public function create() {
        return new static();
     }
  };
  return $poi->create();
}

Test Cases

Diff

// PHPUnit Test Examples:
// TODO: Replace examples and use TDD development by writing your own tests
class MyTestCases extends TestCase
{
    // test function names should start with "test"
    public function testThatSomethingShouldHappen() {
      $this->assertSame(get_class(a()), get_class(a()));
    }
}

MattZ306vs. AllanAlmeida

Bigger number

Simpler ternary way: if a and b really are equal it doesn't matter which one gets returned

Code

Diff

public class BiggerNum{

  /**
   * @param a integer of param1
   * @param b integer of param2
   * @return the bigger integer of a and b
   * If a equals b, return either one
   */
  public static int compare(int a, int b) {
    return a > b ? a : b;
  }
}

Recent Moves:

AllanAlmeidavs. MattZ306

Bigger number

Just another way... A ternary way.

Code

Diff

public class BiggerNum{

  /**
   * @param a integer of param1
   * @param b integer of param2
   * @return the bigger integer of a and b
   * If a equals b, return either one
   */
  public static int compare(int a, int b) {
    return a > b ? a : a < b ? b : a;
  }
}

anikolaienkovs. hissaman

divide arrow function

Bugs

One line version with error output as lambda (analog of arrow function in Python) looks like this.

Code

Diff

div = lambda num1, num2 : print("Division failed: division by zero") if num2 == 0 else print("Division failed: integers and floats accepted only") if not(isinstance(num1, (int, float)) and isinstance(num2, (int, float))) else num1 / num2

Recent Moves:

hissamanvs. Zarif MuhtasimFailed Tests

divide arrow function

Bugs

Single line, arrow function

For some reason the tester is throwing a syntax error but if you test it in the console it runs just fine

Code

Diff

let divide = (num1, num2) => num2 === 0 ? console.log("Division failed: division by zero") : !(num1 === +num1 && num2 === +num2) ? console.log("Division failed: integers and floats accepted only") : num1/num2

Zarif Muhtasimvs. hayeslucas1

divide

Bugs

Code

Diff

def div(num1, num2):
    try:
        return (num1/num2)
    except ZeroDivisionError:
        print("Division failed: division by zero")
    except TypeError:
        print("Division failed: integers and floats accepted only")

anikolaienkovs. virtualcopyright

getSum of array - piece of cake :)

Fundamentals

Arrays

Different way wihout using reduce and forEach.

Code

Diff

function getSum(array) {
   return eval(array.join("+"))
}

1 1 function getSum(array) {
2 - //your code
2 + return eval(array.join("+"))
3 3 }

Recent Moves:

shatodjvs. JakeMaldo

Find the only different number in the array

Fundamentals

Arrays

The same stuff in one line, using reduce enstead of forEach.

Code

Diff

function findOnly(arr) {
  return arr.reduce((acc, cur) => acc ^ cur);
}

1 1 function findOnly(arr) {
2 - let result;
3 - arr.forEach((i) => {
4 - result = i ^ result;
5 - });
6 - return result;
2 + return arr.reduce((acc, cur) => acc ^ cur);
7 7 }

JakeMaldovs. biubiudiv

Find the only different number in the array

Fundamentals

Arrays

Code

Diff

function findOnly(arr) {
  let result;
  arr.forEach((i) => {
    result = i ^ result;
  });
  return result;
}

1 1 function findOnly(arr) {
2 - let result = 0;
2 + let result;
3 3 arr.forEach((i) => {
4 4 result = i ^ result;
5 5 });
6 6 return result;
7 7 }

	1	-	let divide = (num1, num2) => num2 === 0 ? console.log("Division failed: division by zero") : !(num1 === +num1 && num2 === +num2) ? console.log("Division failed: integers and floats accepted only") : num1/num2
1		+	div = lambda num1, num2 : print("Division failed: division by zero") if num2 == 0 else print("Division failed: integers and floats accepted only") if not(isinstance(num1, (int, float)) and isinstance(num2, (int, float))) else num1 / num2

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