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-2.2.1.39	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.38	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.37	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.36	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.35	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.34	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.33	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.32	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.31	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.30	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.29	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.28	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.27	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.26	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.25	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.24	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.23	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.22	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.21	tracks/pony/exercises/difference-of-squares/example.pony
trackler-2.2.1.20	tracks/pony/exercises/difference-of-squares/example.pony