Ruby, which absorbs Perl's regular expressions and Python's readability, is a very human and flexible way to count values, which can be illustrated here:
First , print 7 times "Hello,world", as follows:
Copy Code code as follows:
7.times{puts "Hello,world"}
#在这里, puts's role is equivalent to print+ "\ n"
Second, print 1 in turn. 9, there are more methods in Ruby, which are implemented in simpler ways, as follows:
Copy Code code as follows:
(1..9). each{|i| Print I, ""}
Third, print 1. A number smaller than 7 in 9, as follows:
Copy Code code as follows:
1.upto (9) {|i| print I, "" If I < 7}
four, from 10 to 2 value, and then minus 1 processing, as follows:
Copy Code code as follows:
10.downto (2) Do |i|
Print I, ""
End
v. 1-9 each number in turn *2, and then enter the results as follows:
Copy Code code as follows:
A = 1..9
b = a.collect{|i| I*2}
P b[0..8]
print out elements that are divisible by 3 in the [1..100] array, as follows:
Copy Code code as follows:
A = (1..100). to_a
P a.select{|i| I%3 = = 0}
seven, from 3 to 19, and then add 3 processing, as follows:
Copy Code code as follows:
3.step (19,3) do |i|
Print I, ""
End
