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.

REMOVE SPACE NUMERIC AND CAPS

Ruby lambda function

remove = -> (s) do
  s.gsub(/[^a-z]/, "")
end

Test Cases

Diff

Test.assert_equals(remove.('hell o'), 'hello')
Test.assert_equals(remove.('Hello'),   'ello')
Test.assert_equals(remove.('hel1o'),   'helo')
Test.assert_equals(remove.('Hel1 o'),   'elo')

ejini战神vs.ejini战神

conversion of number int a single digit number

Ruby lambda function

Code

Diff

digital_root = -> (n) do
  n < 10 ? n : digital_root.(n.digits.sum) 
end

Test Cases

Diff

Test.assert_equals(digital_root.(0), 0)
Test.assert_equals(digital_root.(1245358), 1)
Test.assert_equals(digital_root.(8679305), 2)
Test.assert_equals(digital_root.(10101), 3)
Test.assert_equals(digital_root.(4444444444), 4)
Test.assert_equals(digital_root.(50207), 5)
Test.assert_equals(digital_root.(330), 6)
Test.assert_equals(digital_root.(7324), 7)
Test.assert_equals(digital_root.(11111111), 8)
Test.assert_equals(digital_root.(123456789), 9)

ejini战神vs.rowcased

Add the missing Product function

Code

Diff

def prod(numbers)
  numbers.reduce(:*) || 0
end

Test Cases

Diff

Test.assert_equals(prod([1,1]), 1)
Test.assert_equals(prod([]), 0)
Test.assert_equals(prod((1...10)), 362880)

ejini战神vs.ejini战神

Value Added Tax (VAT) and Luxury tax

Code

Diff

def final_price(price)
  (price*(1.1+(price>=1e3 ? 0.3 : 0))).round(2)
end

Test Cases

Diff

Test.assert_equals(final_price(100), 110)
Test.assert_equals(final_price(900), 990)
Test.assert_equals(final_price(2000), 2800)
#edge_cases
Test.assert_equals(final_price(1000), 1400)
Test.assert_equals(final_price(999), 1098.9)      
#rounding
Test.assert_equals(final_price(101), 111.1)

ejini战神vs.steffan153

Multiplying Strings

lambda function in Ruby

Code

Diff

```
f = -> (s, n) do
  s * n
end
```

Test Cases

Diff

Test.assert_equals(f.("lsadfkj", 3), "lsadfkjlsadfkjlsadfkj")
Test.assert_equals(f.("hello", 4), "hellohellohellohello")
Test.assert_equals(f.("hu", 0), "")

rowcasedvs.ejini战神

Rube Goldberg Machine

Code

Diff

```
def rubegoldberg()
  0 ** 0
end
```

Recent Moves:

ejini战神vs.ejini战神

Rube Goldberg Machine

Code

Diff

def rubegoldberg()
    return rand(1..10**rand(1..10)) ** 0
end

Test Cases

Diff

```
Test.assert_equals(rubegoldberg(), 1)
```

ejini战神vs.ejini战神

CharlieM312's Kumite #3

Code

Diff

def numberplatereader(s)
  /[A-Z]{2}\d{2}\s[A-Z]{3}/ === s
end

Test Cases

Diff

Test.assert_equals(numberplatereader("KU63 NZZ"), true)
Test.assert_equals(numberplatereader("AB12 CDE"),true)
Test.assert_equals(numberplatereader("KU63 NZZ"), true)
Test.assert_equals(numberplatereader("12"),false)
Test.assert_equals(numberplatereader(""), false)
Test.assert_equals(numberplatereader("AB12 C0E"),false)
Test.assert_equals(numberplatereader("BDS 1"), false)
Test.assert_equals(numberplatereader("CBS 0"),false)
Test.assert_equals(numberplatereader("KV35 ZHE"), true)
Test.assert_equals(numberplatereader("BB12 BB8"),false)

Recent Moves:

ejini战神vs.rowcased

CharlieM312's Kumite #3

3 chars short

Code

Diff

numberplatereader=lambda*p:bool(__import__('re').match("[A-Z]{2}\d{2}\s[A-Z]{3}",*p))

ejini战神vs.MetHorn

Sum of Two Numbers

This kumite is redundant TBH

Code

Diff

```
from operator import add
```

-−
+import codewars_test as test
-−
+import solution # or from solution import example
-−
-−
+@test.describe("remove")
-−
+def test_group():
-−
+    @test.it("test cases")
-−
+    def test_case():
-−
+        test.assert_equals(remove('hell o'), 'hello')
-−
+        test.assert_equals(remove('Hello'),   'ello')
-−
+        test.assert_equals(remove('hel1o'),   'helo')
-−
+        test.assert_equals(remove('Hel1 o'),   'elo')
-−
-−
-−
 Test.assert_equals(remove.('hell o'), 'hello')
 Test.assert_equals(remove.('Hello'),   'ello')
 Test.assert_equals(remove.('hel1o'),   'helo')
 Test.assert_equals(remove.('Hel1 o'),   'elo')

-−
+import codewars_test as test
-−
+from solution import digital_root
-−
-−
+@test.describe("Example")
-−
+def test_group():
-−
+    @test.it("Digital Root")
-−
+    def test_case():
-−
+        test.assert_equals(digital_root(0), 0)
-−
+        test.assert_equals(digital_root(1245358), 1)
-−
+        test.assert_equals(digital_root(8679305), 2)
-−
+        test.assert_equals(digital_root(10101), 3)
-−
+        test.assert_equals(digital_root(4444444444), 4)
-−
+        test.assert_equals(digital_root(50207), 5)
-−
+        test.assert_equals(digital_root(330), 6)
-−
+        test.assert_equals(digital_root(7324), 7)
-−
+        test.assert_equals(digital_root(11111111), 8)
-−
+        test.assert_equals(digital_root(123456789), 9)
 Test.assert_equals(digital_root.(0), 0)
 Test.assert_equals(digital_root.(1245358), 1)
 Test.assert_equals(digital_root.(8679305), 2)
 Test.assert_equals(digital_root.(10101), 3)
 Test.assert_equals(digital_root.(4444444444), 4)
 Test.assert_equals(digital_root.(50207), 5)
 Test.assert_equals(digital_root.(330), 6)
 Test.assert_equals(digital_root.(7324), 7)
 Test.assert_equals(digital_root.(11111111), 8)
 Test.assert_equals(digital_root.(123456789), 9)

-−
+from functools import reduce
-−
+from operator import mul
-−
-−
+def prod(numbers):
-−
+    return reduce(mul, numbers or [0], 1)
 def prod(numbers)
   numbers.reduce(:*) || 0
 end

-−
+import codewars_test as test
-−
+# TODO Write tests
-−
+import solution # or from solution import example
-−
-−
+# test.assert_equals(actual, expected, [optional] message)
-−
+@test.describe("Simple tests")
-−
+def test_group():
-−
+    @test.it("Short lists")
-−
+    def test_case():
-−
+        test.assert_equals(prod([1,1]), 1)
-−
+        test.assert_equals(prod([]), 0)
-−
+        test.assert_equals(prod(range(1,10)), 362880)
 Test.assert_equals(prod([1,1]), 1)
 Test.assert_equals(prod([]), 0)
 Test.assert_equals(prod((1...10)), 362880)

-−
+# test.assert_equals(actual, expected, [optional] message)
-−
+@test.describe("These are your Test results")
-−
+def test_group():
-−
+    @test.it("test case")
-−
+    def test_case():
-−
+        #basic tests
-−
+        test.assert_equals(final_price(100), 110);
-−
+        test.assert_equals(final_price(900), 990);
-−
+        test.assert_equals(final_price(2000), 2800);
-−
+        #edge_cases
-−
+        test.assert_equals(final_price(1000), 1400);
-−
+        test.assert_equals(final_price(999), 1098.9);
-−
+        #rounding
-−
+        test.assert_equals(final_price(101), 111.1);
 Test.assert_equals(final_price(100), 110)
 Test.assert_equals(final_price(900), 990)
 Test.assert_equals(final_price(2000), 2800)
 #edge_cases
 Test.assert_equals(final_price(1000), 1400)
 Test.assert_equals(final_price(999), 1098.9)
 #rounding
 Test.assert_equals(final_price(101), 111.1)

-−
+f=str.__mul__
 f = -> (s, n) do
   s * n
 end

-−
+Test.describe("Basic Tests")
-−
+test.assert_equals(f("lsadfkj", 3), "lsadfkjlsadfkjlsadfkj")
-−
+test.assert_equals(f("hello", 4), "hellohellohellohello")
-−
+test.assert_equals(f("hu", 0), "")
 Test.assert_equals(f.("lsadfkj", 3), "lsadfkjlsadfkjlsadfkj")
 Test.assert_equals(f.("hello", 4), "hellohellohellohello")
 Test.assert_equals(f.("hu", 0), "")

-−
+from random import randint
-−
-−
+def rubegoldberg():
-−
+    return randint(1, 10**randint(1, 10)) ** 0
 def rubegoldberg()
     return rand(1..10**rand(1..10)) ** 0
 end

	1	−	test.assert_equals(rubegoldberg(), 1)
1		+	Test.assert_equals(rubegoldberg(), 1)

	1	−	numberplatereader=lambdap:__import__('re').match("[A-Z]{2}[0-9]{2}\s[A-Z]{3}",p)!=None
1		+	numberplatereader=lambdap:bool(__import__('re').match("[A-Z]{2}\d{2}\s[A-Z]{3}",p))

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