7 kyu
The reject() function
3,171 of 4,303user5363957
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Arrays
Fundamentals
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I like this kata. Thanks
C Translation
very nice one thx
very useful kata. makes me learn something new. thank you
I suggest improving the instructions and adding more test cases
There is a problem writing instructions?
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Sorry to say, this is the most unclear kata i have ever seen. Please add some clearer description, such as the reject function needs to reject the iterator function.
Fixed.
Thanks
@FArekkusu i think not yet... still needs more fixation...
The description is non-existent.
Fixed.
python translation
Added Haskell and Typescript translations, please take a look.
They're mutually exclusive because they both modify the description differently. Also, no random tests ( Haskell, at least. didn't look at Typescript ). The fact that the original doesn't have any does not mean translations don't need them either.
If you add random tests and supply a unified description, I'll approve them both.
I was hesitant to add random tests since the javascript original didn't, but oh well. Changes made.
The second parameter really should be called "predicate", as it represents a boolean function, whereas the term "iterator" describes some kind of cursor that allows its user to traverse a container. There is quite a difference between those two concepts, I would say.
I did that way in my python translation. Thanks
Fixed.
PHP Translation Kumited - please carefully review and approve :D
Javascript version of Kata could have done with a lot more test cases, both fixed and random.
Hi, I've added a CoffeeScript translation, if you want to approve it, instructions for the approval process are here.
I have finished JS in codecademy, but they never explained about reject functions ! What to do now ? I thought this is a platform to learn and if so , how?
Welcome in CodeWars!
If in codecademy they never explained about
rejectfunction it's because this function doesn't exist. Actually as most of time in CodeWars you'll have to implement a new function. In this kata the function wil bereject.As shown in the example . . .
. . . this
rejectfunction take 2 arguments :array([1, 2, 3, 4, 5, 6] in the example)function( function(num){ return num % 2 == 0; } ). This function get a "num" argument and returnstrueif this argument is even (if num is odd then num%2==1).The
rejectfunction returns a new array. If you compare the array passed as argument and the returned array you can see the returned array is the same as the passed one except the even items were removed (or should I say rejected ? )So it seems the
rejectfunction should be a function taking 2 arguments (an array and a function taking succesively as argument each item of the provided array and returning a boolean) and returning a copy of provided array without the items which the function-test.Another example could be :
Hope it helps.
@danhin Pick 'Kata' from the left side menu so you can filter the kata. Choose 8 kyu. That is beginners level.
The task for this Kata is unclear. I supposed it needed an array with even numbers filtered out.
That was a really interesting program. After a few minutes, it actually became very clear what it was asking.
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It needs a test case to reject the people who are accidentally returning the value, rather than
true/falseThis one gave me way more trouble that it ought to have.
Hello, I'm don't have experience in testing, i'm getting this result from my test and i don't get it:
Test Failed: Expected: [1,3,5], instead got: [1,3,5]
Use Test.assertSimilar instead of Test.assertEquals.
Works! Is this because Expected has the same value as got but is not the same object?
yes, that's the reason.
I don't understand exactly what I am being asked to do here :/?
neither do I... What exactly can the input be? More than just numbers?
The input is an array of values of arbitrary type for the first argument, and a function for the second. The signature of the
rejectfunction looks like this:I'm unsure whether I should post this information. If the kata implies discovering all this information on one's own, I'll remove it.
Hi,
Try adding some more test cases, for example test an array that contains only even numbers: Test.assertSimilar(reject([2, 4, 6, 8, 10, 12], function(num){ return num % 2 == 0; }), []);
Or only odd numbers: Test.assertSimilar(reject([1, 3, 5, 7, 9, 11], function(num){ return num % 2 == 0; }), [1, 3, 5, 7, 9, 11]);
The result from those should show you where you're going wrong.
Hi guys,
The test will pass with Test Passed: Value == [1,3,5]. When i try to save i get this error message Test Failed: Expected: ["a","b","d"], instead got: ["a","b",3,"d"]
I have no clue why? Someone can help?
Similar.My error message is "Test Failed: Expected: ["a","b","d"], instead got: [3]"
Me too.