Course of Raku / Advanced / Operators / Meta-operators / Exercises / Average of an array

Solution: Average of an array

Here is a possible solution to the task.

Code

my @data = 10, 20, 30, 40;

say ([+] @data) / @data.elems;

🦋 You can find the source code in the file sum-of-array.raku.

Output

Comments

The reduction meta-operator [+] places the + operator between all the elements of @data, so [+] @data is equivalent to 10 + 20 + 30 + 40, that is, 100. The parentheses are needed so that the reduction happens before the division.
Dividing the sum by @data.elems, the number of elements, gives the average 25. Had the result not divided evenly, Raku would have produced an exact Rat rather than rounding.

← Average of an array | Every factorial at once →