Filter an array that includes every/some of the elements of a given array

filter_includes.gd

func filter_includes(type: String, base_array: Array, filter_array: Array, filter_key: String = "") -> Array:
	var filtered_array := []

	for base_item in base_array:
		var count = 0
		var search_item = base_item

		if filter_key:
			search_item = base_item[filter_key]

		if type == "every":
			for filter_item in filter_array:
				if filter_item in search_item:
					count += 1
			if count == filter_array.size():
				filtered_array.append(base_item)
		elif type == "some":
			for filter_item in filter_array:
				if filter_item in search_item:
					filtered_array.append(base_item)
					break

	return filtered_array

Example:

var array1 := [
	{"tags": ["lala", "lele"]},
	{"tags": ["lele", "lili"]},
	{"tags": ["lili", "lolo"]},
	{"tags": ["lolo", "lulu"]},
]

var array2 := [
	["lala", "lele"],
	["lele", "lili"],
	["lili", "lolo"],
	["lolo", "lulu"],
]

var array3 := ["lala", "lele", "lili"]

var search_array := ["lala", "lele"]

var result1 := filter_includes("every", array1, search_array, "tags")
# Prints [{tags:[lala, lele]}]
var result2 := filter_includes("every", array2, search_array)
# Prints [[lala, lele]]
var result3 := filter_includes("some", array1, search_array, "tags")
# Prints [{tags:[lala, lele]}, {tags:[lele, lili]}]
var result4 := filter_includes("some", array2, search_array)
# Prints [[lala, lele], [lele, lili]]
var result5 := filter_includes("every", array3, search_array)
# Prints []
var result6 := filter_includes("some", array3, search_array)
# Prints [lala, lele]

I've updated the function. Thanks to jeyzu on Reddit.