enumerables.rb

module Enumberable
	def my_each(arr)
    	i = 0
    	if block_given?
        	(arr.size).times{
            		yield arr[i]
            		i+= 1
        	}
        	arr
    	end
	end
	def my_each_with_index(arr)
    	i = 0
    	(arr.size).times{
        	yield arr[i],i
        	i+= 1
    	}
    	arr
	end
	def my_select(arr)
		result = []
		my_each(arr){|x| result << x if yield(x)}
        result
	end
	def my_all?(arr)
	    my_each(arr){|x| return false if !yield(x)}
    	true
	end
	def my_any?(arr)
    	my_each(arr){|x| return true if yield(x)}
    	false
	end
	def my_none?(arr)
		if block_given?
			my_each(arr){|x| return false if yield(x)}
			true
		else
			my_each(arr){|x| return false if x}
			true
		end
	end
	def my_count(arr)
    		counter = 0
		if block_given?
    		my_each(arr){|x| counter += 1 if yield(x)}
		else
    		my_each(arr){|x| counter += 1 if x} 
		end
    	counter
	end
	def my_map(arr)
		new_arr = []
		if block_given?
	        my_each(arr){|x| new_arr << yield(x)}
	        new_arr
    	end
	end
	def my_map_proc(arr, proc=nil)
		new_arr = []
		if block_given? && proc
			my_each(arr){|x| new_arr << yield(x)}
	        my_each(arr){|x| new_arr << proc.call(x)}
	        new_arr
		end
	end
	def my_inject(arr, memo=0)
		if block_given?
    		my_each(arr){|x| memo = yield(memo, x)}
    		memo
		end
	end
	def multiply_els(arr)
		my_inject(arr,1){|sum,x| sum = sum * x}
	end
end