Ruby If Nil Then

In non legal ruby consider this.

Ruby if nil then.

Returns nil if the instance was nil and nonzero. These types were fixnum float falseclass trueclass string and regex. Somebody may 26 11 at 19 12 if request nil. Then again i also consider the not really readable either.

From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero. When the ruby interpreter boots up it initializes falseclass trueclass and nilclass. If the number was 0. Response responses to a first if response do something happy path else do something else end.

I picked various ruby types to test in case the results changed based on the type. They are singleton instances of falseclass and trueclass respectively. It s also a falsy value meaning that it behaves like false when used in a conditional statement. First you need to know that false and true variables work exactly the same way as nil does.

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. Notice ruby uses elsif not else if nor elif. The values false and nil are false and everything else are true.

To be honest i don t think that these examples are really that great. Let s evaluate their usefulness and potential problems that they bring to the table. Else code end if expressions are used for conditional execution. There are plenty of options available.

In ruby on rails what s the difference actually. Array 1 dog nil array. Well nil is a special ruby object used to represent an empty or default value. 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.

This will return the first element of responses or nil then because conditional statements treat nil as false we can write. How to check in ruby that some variable in our case it s request is not an instance of nil. Elsif conditional then code.