Contents

use "collections"
use "itertools"

primitive Squares
  fun square_of_sums(n: USize): USize =>
    let sum = (n * (n + 1)) / 2
    sum * sum

  fun sum_of_squares(n: USize): USize =>
    try
      Iter[USize](Range(0, n + 1))
        .map[USize]({(x: USize): USize => x * x })
        .fold[USize]({(acc: USize, x: USize): USize => acc + x }, 0)?
    else
      0
    end

  fun difference(n: USize): USize =>
    square_of_sums(n) - sum_of_squares(n)

Version data entries

46 entries across 46 versions & 1 rubygems

Version	Path
trackler-2.2.1.59	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.58	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.57	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.56	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.55	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.54	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.53	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.52	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.51	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.50	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.49	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.48	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.47	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.46	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.45	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.44	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.43	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.42	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.41	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.40	tracks/pony/exercises/difference-of-squares/example.pony