Course of Raku / Essentials / Positional data types / Exercises / Odd indices

Solution: Odd indices

To solve this task, you can use the loop construct and increment the loop variable by 2 on each iteration. But you can also use a for loop and scan the numbers from 1 to the half of the length of the array, and then multiply them by two.

Code

Here is the solution:

my @data = 10, 12, 1, 5, -9, 8, 36, 18, 21;

say @data[2 * $_ - 1] for 1 .. @data/2;

🦋 Find the program in the file odd-indices.raku.

Output

First, run the program with the original data elements.

$ raku exercises/positionals/odd-indices.raku
12
5
8
18

Then, add one more item to the data:

my @data = 10, 12, 1, 5, -9, 8, 36, 18, 21, 22;

Confirm the new element with an odd index appears in the output:

$ raku exercises/positionals/odd-indices.raku
12
5
8
18
22

Comments

In the next part of the course, we will return to this task to solve it using a completely different approach.

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