For with a step in Julia

In Julia, the for loop is used to iterate over a collection of values such as arrays, tuples, or ranges. It follows the following syntax:

for  in 
    
end

Here, represents the loop variable which is assigned each value in one by one, and represent the code to be executed for each iteration.

If you want to perform a for loop with a step, you can add the step keyword and specify the step size after the range or collection. Here's an example to better illustrate how to use for with a step:

# Example 1: For loop over a range with step 2
for i in 1:2:10
    println(i)
end
# Output: 1 3 5 7 9
# Example 2: For loop over an array with step 3

arr = [1, 2, 3, 4, 5, 6, 7, 8, 9]
for i in arr[1:3:end]

    println(i)

end
# Output: 1 4 7

In the first example, we iterate over the range 1:2:10 with a step of 2. This means that we start from 1, increment by 2, and stop at 10. The loop variable i takes on the values 1, 3, 5, 7, and 9, which are printed out to the console.

In the second example, we iterate over the array arr with a step of 3. We use the indexing [1:3:end] to select every third element in the array starting from the first element. This means that the loop variable i takes on the values [1, 4, 7], which are printed out to the console.