Ruby If Nil Then

To be honest i don t think that these examples are really that great.

Ruby if nil then. In non legal ruby consider this. These types were fixnum float falseclass trueclass string and regex. They are singleton instances of falseclass and trueclass respectively. The values false and nil are false and everything else are true.

It s also a falsy value meaning that it behaves like false when used in a conditional statement. I picked various ruby types to test in case the results changed based on the type. Array 1 dog nil array. Count not nil or.

If conditional then code. When the ruby interpreter boots up it initializes falseclass trueclass and nilclass. Array 1 dog nil array. There are plenty of options available.

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. Else code end if expressions are used for conditional execution. First you need to know that false and true variables work exactly the same way as nil does. From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero.

How to check in ruby that some variable in our case it s request is not an instance of nil. Then again i also consider the not really readable either. If the number was 0. Let s evaluate their usefulness and potential problems that they bring to the table.

This will return the first element of responses or nil then because conditional statements treat nil as false we can write. Elsif conditional then code. Well nil is a special ruby object used to represent an empty or default value. Somebody may 26 11 at 19 12 if request nil.

Nil granted not very readable. Notice ruby uses elsif not else if nor elif. Returns nil if the instance was nil and nonzero.