Interactive mode

The interactive mode (a.k.a. REPL) is available by simply executing the sidef command, or by specifying the -i command-line switch.

$ sidef -i
Sidef 3.99, running on Linux, using Perl v5.34.0.
Type "help", "copyright" or "license" for more information.
>> n = 41
=> 41
>> n**2 + n - 1
=> 1721
>>