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enumerable.rb
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enumerable.rb
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module Enumerable
def my_each
i = 0
arr = self.to_a
while i < self.size
yield arr[i]
i += 1
end
self
end
def my_each_with_index
i = 0
arr = self.to_a
while i < self.size
yield arr[i], i
i += 1
end
self
end
def my_select
arr = self.to_a
arr_return = Array.new
i = 0
while i < self.size
if yield(arr[i])
arr_return.push(arr[i])
end
i += 1
end
arr_return
end
def my_all?
arr = self.to_a
false_counter = 0
i = 0
while i < self.size
break if false_counter > 0
if block_given?
if yield(arr[i]) == false
false_counter += 1
end
elsif arr[i].nil? or arr[i] == false
false_counter += 1
end
i += 1
end
false_counter == 0 ? true : false
end
def my_any?
arr = self.to_a
true_counter = 0
i = 0
while i < self.size
break if true_counter > 0
if block_given?
if yield(arr[i]) == true
true_counter += 1
end
elsif arr[i] != nil and arr[i] != false
true_counter += 1
end
i += 1
end
true_counter == 0 ? false : true
end
def my_none?
arr = self.to_a
true_counter = 0
i = 0
while i < self.size
break if true_counter > 0
if block_given?
if yield(arr[i]) == true
true_counter += 1
end
elsif arr[i] != nil and arr[i] != false
true_counter += 1
end
i += 1
end
true_counter == 0 ? true : false
end
def my_count(item = nil)
arr = self.to_a
counter = 0
i = 0
return self.size if item.nil? and block_given? == false
while i < self.size
if block_given?
counter += 1 if yield(arr[i]) == true
else
counter += 1 if arr[i] == item
end
i += 1
end
counter
end
def my_map(proc = nil)
arr = self.to_a
new_arr = Array.new
i = 0
while i < self.size
if block_given?
new_arr << yield(arr[i])
else
new_arr << proc.call(arr[i])
end
i += 1
end
new_arr
end
def my_inject(arg1 = nil, arg2 = nil)
arr = self.to_a
memo = arr[0]
i = 1
if arg2
i = 0
sym = arg2
memo = arg1
else
sym = arg1
end
if block_given? and arg1
i = 0
memo = arg1
end
if block_given?
while i < self.size
memo = yield memo, arr[i]
i += 1
end
else
while i < self.size
memo = memo.send(sym, arr[i])
i += 1
end
end
memo
end
end
=begin
## Test Suite From Ruby 2.3.4 Docs @ http://ruby-doc.org/ ##
#SELECT
(1..10).my_select { |i| i % 3 == 0 } #=> [3, 6, 9]
[1,2,3,4,5].my_select { |num| num.even? } #=> [2, 4]
#ALL?
%w[ant bear cat].my_all? { |word| word.length >= 3 } #=> true
%w[ant bear cat].my_all? { |word| word.length >= 4 } #=> false
[nil, true, 99].my_all? #=> false
#ANY?
%w[ant bear cat].any? { |word| word.length >= 3 } #=> true
%w[ant bear cat].any? { |word| word.length >= 4 } #=> true
[nil, true, 99].any? #=> true
#NONE?
%w{ant bear cat}.my_none? { |word| word.length == 5 } #=> true
%w{ant bear cat}.my_none? { |word| word.length >= 4 } #=> false
[].my_none? #=> true
[nil].my_none? #=> true
[nil, false].my_none? #=> true
[nil, false, true].my_none? #=> false
#COUNT
ary = [1, 2, 4, 2]
ary.my_count #=> 4
ary.my_count(2) #=> 2
ary.my_count{ |x| x%2==0 } #=> 3
#MAP
(1..4).my_map { |i| i*i } #=> [1, 4, 9, 16]
(1..4).my_map { "cat" } #=> ["cat", "cat", "cat", "cat"]
#INJECT
(5..10).my_inject(:+) #=> 45
(5..10).my_inject { |sum, n| sum + n } #=> 45
(5..10).my_inject(1, :*) #=> 151200
(5..10).my_inject(1) { |product, n| product * n } #=> 151200
longest = %w{ cat sheep bear }.my_inject do |memo, word|
memo.length > word.length ? memo : word
end
longest #=> "sheep"
def multiply_els(array)
array.my_inject(:*)
end
=end