should not be best practice

I'm sure this solution works for all the test cases, but what if another data type such as array, hash or boolean was passed to this function? Didn't the problem specifically ask for an error message in response to a string?

spoiler flag, plz...

So a possible solution would be to use sample(3)in order to check if only 3 randomly picked samples from the array are even, righ?

I like this one. How does it perform performance-wise?

@Roots2D:

symbols.key(c) ensures that value 'c' has a proper matching key (an opening parenthesis).
If it did have a proper opening parentheses, then symbols.key(c) would return true.

If we didn't have it, then the block would return false if 'c' is anything other than an opening parenthesis.

Hope this helps
Let me know if you have any other questions

Huh... I didn't about the chr method. It gives you the first letter of a string. Cool

this fails in case of non equal either both odd or both even numbers

what is the significance of (if symbols.key(c) && symbols.key(c) != stack.pop) compared to (if symbols.key(c) != stack.pop)?

thank you el cortez! i wish every questions had an explanation.

Wait, what?

can anyone explain this?