any and all

Part of the Logic & Flow section of Coddy's GDScript journey. Lesson 63 of 78.

any() and all() ask a yes-or-no question about a whole array. Both take a function that returns true or false for one element:

any() returns true if the function returns true for at least one element.
all() returns true if the function returns true for every element.

var enemy_hp = [30, 0, 12]
print(enemy_hp.any(func(hp): return hp == 0))
print(enemy_hp.all(func(hp): return hp > 0))

true
false

One enemy has 0 HP, so any() is true, and that same enemy makes all() false.

Both stop as soon as the answer is known: any() at the first true, all() at the first false. They work with named functions too, like numbers.all(is_even).

On an empty array, any() returns false, because no element passes, and all() returns true, because no element fails.

Use them in a condition in place of a loop with a flag variable:

var inventory = ["sword", "key", "rope"]
if inventory.any(func(item): return item == "key"):
	print("The door opens")

Challenge

Easy

The program reads one line of scores separated by commas and stores them in the array numbers. This part is already written.

Print two lines:

Any perfect: followed by true if at least one score is 100, otherwise false
All passed: followed by true if every score is 50 or more, otherwise false

Use any() for the first line and all() for the second. For the input 100,75,40, the output is:

Any perfect: true
All passed: false

Try it yourself

extends Node

func _ready():
	var numbers := []
	for part in OS.read_string_from_stdin().split(","):
		numbers.append(int(part))
	# Print the two lines with any() and all()