upto with / without {}

1.upto 3 do |x|
  puts x
end
# 1
# 2
# 3
1.upto(3) { |x| puts x }
# 1
# 2
# 3

1.	use the upto iterator, which is what traditional for loops translate into in Ruby.
2.	Use an upto Iterator to reference array element
3.	uses the upto iterator to create a loop similar to a for loop from other languages
4.	use curly braces ({}):
5.	The upto Method and for loop
6.	Example of upto that prints out a times table for 2
7.	do all the times tables from 1 to 12
8.	One date may upto another
9.	Interpolation with upto and array

upto with / without {} : upto « Statement « Ruby