We prefer 'if' conditional block over a trailing 'if' for multiline code.
For code with single line adding if condition at the end is definitely preferred but for multiline code it makes it more readable and the developer does not have to read the whole block of code only to realize that its conditional.
Condition on multiline Code:
1#bad
2def update
3 return render json: {errors: "You can't to edit this directory"},
4 status: :forbidden if @directory.master?
5end
6
7#preferred
8def update
9 if @directory.master?
10 return render json: {errors: "You can't to edit this directory"},
11 status: :forbidden
12 end
13end
Condition on block of code:
1#bad
210.times do
3 # multi-line body omitted
4end if some_condition
5
6#preferred
7if some_condition
8 10.times do
9 # multi-line body omitted
10 end
11end