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Idiom # 202: Sum of squares
Idiom # 202: Sum of squares
See
programming-idioms.org
:
Code
# using sum and map sum := sum (a.map x->x*x) # using map and fold sum := a.map x->x*x .fold i32.sum # using a loop for sum := 0, sum + q v in a q := v*v else say "sum is $sum" # using a tail-recursive function sum_of_squares (sum i32, s list i32) i32 => s ? nil => sum | c Cons => sum_of_squares (sum + c.head**2) c.tail
What are effects?
Running Example
ex202 is a := [0, 8, 15, 47, 11] # using sum and map sum_map => sum := sum (a.map x->x*x) say "sum is $sum" sum_map # using map and fold sum_map_fold => sum := a.map x->x*x .fold i32.sum say "sum is $sum" sum_map_fold # using a loop sum_loop => for sum := 0, sum + q v in a q := v*v else say "sum is $sum" sum_loop # using a tail-recursive function sum_tail_rec => sum_of_squares (sum i32, s list i32) i32 => s ? nil => sum | c Cons => sum_of_squares (sum + c.head**2) c.tail say "sum is {sum_of_squares 0 a.as_list}" sum_tail_rec
What are effects?
last changed: 2024-07-01
next: Idiom # 203: Calculate mean and standard deviation
