Example:
class CustomObject
.....
def ==(other)
self.x == other.x && self.y =! other.y
end
.....
end
array_of_custom_objects = CustomObject.load_for(company_id: company_id)
new_custom_object = CustomObject.new(....)
array_of_custom_objects.include? new_custom_object
My question is does the array include? method compare two objects bases on the defination of == method?
Bascially, will the above code determine whether my new_custom_object is included in the array of CustomObject by evaluating the overridden == method for each insance of CustomObject in the array with new_custom_object?
My question is does the array include? method compare two objects bases on the defination of == method?
Yes. As said in: https://ruby-doc.org/3.2.0/Array.html#method-i-include-3F
include?(obj) → true or false click to toggle source
Returns true if for some index i in self, obj == self[i]; otherwise false:
Seems to be working, (though I'm not sure if this is the most optimal way of doing things as we don't know the context of your code):
class CustomObject
attr_reader :x, :y, :z
def initialize(x, y, z)
@x = x
@y = y
@z = z
end
def ==(other)
self.x == other.x && self.y != other.y
end
end
custom_objects = []
new_custom_object_1 = CustomObject.new(1, 2, 3)
custom_objects << new_custom_object_1
new_custom_object_2 = CustomObject.new(2, 3, 4)
custom_objects << new_custom_object_2
search_object = CustomObject.new(2, 7, 4) # 2 == 2 && 3 != 7
puts custom_objects.include?(search_object)
# => true
search_object = CustomObject.new(2, 3, 4) # 2 == 2 && 3 != 3
puts custom_objects.include?(search_object)
# => false