"in" python operator equivalent in ruby

Ruby
1

Hi,

I’m new to ruby and I woud like to know if there is some “in” operator in this language. In python i can do, do for example:

if x in a: print(‘x is in a!’)

I wonder if in ruby there is some equivalent operator.

2

There is indeed: the include? method. For example:

print('x is in a!') if a.include?(x)
1 Like
3

And there’s also in keyword in Ruby, just like Python when it comes to iterating over an array using for loops:

ary = %w(apple banana cherry date)
for i in ary do
	print("Hello #{i}!\n")
end

Or in case of iterating over a range with for loop:

for i in 1..15
	puts i
end

https://docs.ruby-lang.org/en/2.7.0/syntax/control_expressions_rdoc.html

In python, you can do:
a = 1, 2, 3
1 in a # => True

In Ruby you can use the following methods:

a = 1, 2, 3
a.include?(1)    # => true
a.index(2)        # => 1
[1, 2] & a         # => [1, 2]
[5, 6] & a         # => []
[1, 10].&(a).empty?    # => false
[5, 6].&(a).empty?      # => true

Hope this helps!

1 Like
4

Thank you for the answer!

5

Thanks! I’ve already seen the include method. I just wondering if there is something for iteration over arrays.

6

Not sure what you mean. There are lots of ways to iterate over arrays. Can you be more specific about what you’re looking for?

7

In Python are used to determine whether a value is of a certain class or type. They are usually used to determine the type of data a certain variable contains.