Write javascript for loop in ruby

The JavaScript For Loop resembles the for loop you may have seen in many other programming languages. It is used when you need to do a set of operations many times, with an increment of some kind after each run through the block of code.

for(i=0;i<=10;i++)
{
alert("Counter i = " + i);
}

For loop in ruby

for i in 0..10
   puts "counter i is #{i}"
end

Now i had a javascript for loop with variable incremented to 2

for ( var i = 0; i <=10; i += 2 )
{
alert("Counter i = " + i);
}

Now in ruby i can go with step instead of default for

0.step(10,2) { |i| puts i }