In Ruby, the for statement is used to loop over a sequence of elements. It is often used with the in operator to specify the range of elements to process.
Here is the basic syntax:
for variable in collection
# Code to be executed for each element
end
Here, variable represents an iteration variable, and collection represents the sequence of elements to loop over.
Here is an example of using a for loop in Ruby to iterate over an array of numbers:
numbers = [1, 2, 3, 4, 5]
for num in numbers
puts num
end
This will output:
1
2
3
4
5
In this example, the for loop assigns each element in the numbers array to the num variable, and then the value of num is printed to the console.
Here is another example of using a for loop to loop over a range of numbers and perform some operation on each:
for i in 1..10
puts i * 2
end
This will output:
2
4
6
8
10
12
14
16
18
20
In this example, the for loop uses a range of numbers from 1 to 10, and multiplies each number by 2 before printing the result to the console.