Ruby If Nil Then

Count not nil or.

Ruby if nil then.

Returns nil if the instance was nil and nonzero. There are plenty of options available. First you need to know that false and true variables work exactly the same way as nil does. Array 1 dog nil array.

From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero. I picked various ruby types to test in case the results changed based on the type. These types were fixnum float falseclass trueclass string and regex. Somebody may 26 11 at 19 12 if request nil.

If conditional then code. In non legal ruby consider this. When the ruby interpreter boots up it initializes falseclass trueclass and nilclass. Response responses to a first if response do something happy path else do something else end.

This will return the first element of responses or nil then because conditional statements treat nil as false we can write. Else code end if expressions are used for conditional execution. 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.

Nil granted not very readable. It s also a falsy value meaning that it behaves like false when used in a conditional statement. Notice ruby uses elsif not else if nor elif. I used these nil check conditions on each of the types to see if there was a difference between them performance wise.

Then again i also consider the not really readable either. If the number was 0. They are singleton instances of falseclass and trueclass respectively. Array 1 dog nil array.

Elsif conditional then code. To be honest i don t think that these examples are really that great. In ruby on rails what s the difference actually.