Ruby If Nil Then

Else code end if expressions are used for conditional execution.

Ruby if nil then.

Returns nil if the instance was nil and nonzero. Count not nil or. I used these nil check conditions on each of the types to see if there was a difference between them performance wise. Array 1 dog nil array.

Somebody may 26 11 at 19 12 if request nil. Array 1 dog nil array. First you need to know that false and true variables work exactly the same way as nil does. To be honest i don t think that these examples are really that great.

Elsif conditional then code. If the number was 0. If conditional then code. In ruby on rails what s the difference actually.

Notice ruby uses elsif not else if nor elif. Then again i also consider the not really readable either. I picked various ruby types to test in case the results changed based on the type. Nil granted not very readable.

It s also a falsy value meaning that it behaves like false when used in a conditional statement. Well nil is a special ruby object used to represent an empty or default value. They are singleton instances of falseclass and trueclass respectively. These types were fixnum float falseclass trueclass string and regex.

Let s evaluate their usefulness and potential problems that they bring to the table. When the ruby interpreter boots up it initializes falseclass trueclass and nilclass. In non legal ruby consider this. From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero.

But if request suffices in ruby nil and false are the only values that will fail an if and you can t get false here to confuse the issue. The values false and nil are false and everything else are true. How to check in ruby that some variable in our case it s request is not an instance of nil.