range function:

Create a new list with items from 0 to the second argument. If the second argument is not a positive integer, return nothing. Be carefull not to use large numbers.

Examples:

• running: (range 4) will give: [0, 1, 2, 3]

• running: (range -4) will return nothing

• running: (range [1, 2, 3, 4]) will return nothing