List comprehension

Question

Is there a way to implement list comprehensions to GDScript? Like in this code in Python

[n for n in range(5)]

what's the GDScript equivalent to this?

Answer 1

GDScript is not Python, and does not have comprehensions.

Answer 2

You could write your own scripts that do that. Actually I'll try that and hopefully share it in github.

Comments

Scripts can't extend GDScript syntax, so you'd have to provide this with a method and string… and it would be quite inefficient.

Godot 4.0 will have first-class functions, lambdas, and map/filter/reduce functions in the Array class.

Answer 3

I'd noticed something nifty playing around with gdscript.

var xxx = Array(PoolIntArray(range(3)))

The above is equal to python 3's:

xxx = list(range(3))

Or

xxx = [n for n in range(3)]

Hope it helps

Answer 4

You can use a for loop and an empty array:

var my_range = []
for n in range(5):
    var o = n  # Do something interesting with n here.
    my_range.append(o)

Answer 5

This is kind of a silly, over-complicated way of doing it, but it works:

var doubled_array = (func(amt=5, a=[]): for n in range(amt): a.append(n * 2); if n + 1 == amt: return a).call()

The Python equivalent would be:

doubled_list = [n * 2 for n in range(5)]

At that point, you're better off just making a regular for loop with a previously initialized empty array like edupo suggested.

Answer 6

Since Godot 4, You can use map for this

var doubled = range(5).map(func(n): return n * 2)

python equivalent:

doubled = [n * 2 for n in range(5)]