Boolean Logic

Truthy / Falsy

RSL supports truthy/falsy logic.

For those unfamiliar, this means that, instead of writing the following (as an example):

if len(my_list) > 0:
    print("My list has elements!")

you can write

if my_list:
    print("My list has elements!")

Essentially, you can use any type as a condition, and it will resolve to true or false depending on the value.

The following table shows which values return false for each type. All other values resolve to true.

Type	Falsy	Description
string	""	Empty strings
int	0	Zero
float	0.0	Zero
list	[]	Empty lists
map	{}	Empty maps

Note that a string which is all whitespace e.g. " " is truthy.