Raindrops

Convert a number to a string, the contents of which depend on the number's factors.

If the number has 3 as a factor, output 'Pling'.
If the number has 5 as a factor, output 'Plang'.
If the number has 7 as a factor, output 'Plong'.
If the number does not have 3, 5, or 7 as a factor, just pass the number's digits straight through.

Examples

28's factors are 1, 2, 4, 7, 14, 28.
- In raindrop-speak, this would be a simple "Plong".
30's factors are 1, 2, 3, 5, 6, 10, 15, 30.
- In raindrop-speak, this would be a "PlingPlang".
34 has four factors: 1, 2, 17, and 34.
- In raindrop-speak, this would be "34". ## Source

A variation on a famous interview question intended to weed out potential candidates. http://jumpstartlab.com

Version compatibility

This exercise has been tested on Julia versions >=1.0.

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

Your solution



In [ ]:

    
# submit
function raindrops(number::Int)

end

Test suite



In [ ]:

    
using Test

# include("raindrops.jl")

@testset "detect numbers" begin
    @testset "the sound for 1 is 1" begin
      @test raindrops(1) == "1"
    end
    @testset "2 to the power 3 does not make a raindrop sound as 3 is the exponent not the base" begin
      @test raindrops(8) == "8"
    end
    @testset "the sound for 52 is 52" begin
      @test raindrops(52) == "52"
    end
end

@testset "detect pling" begin
    @testset "the sound for 3 is Pling" begin
      @test raindrops(3) == "Pling"
    end
    @testset "the sound for 6 is Pling as it has a factor 3" begin
      @test raindrops(6) == "Pling"
    end
    @testset "the sound for 9 is Pling as it has a factor 3" begin
      @test raindrops(9) == "Pling"
    end
    @testset "the sound for 27 is Pling as it has a factor 3" begin
      @test raindrops(27) == "Pling"
    end
end

@testset "detect plang" begin
    @testset "the sound for 5 is Plang" begin
      @test raindrops(5) == "Plang"
    end
    @testset "the sound for 10 is Plang as it has a factor 5" begin
      @test raindrops(10) == "Plang"
    end
    @testset "the sound for 25 is Plang as it has a factor 5" begin
      @test raindrops(25) == "Plang"
    end
    @testset "the sound for 3125 is Plang as it has a factor 5" begin
      @test raindrops(3125) == "Plang"
    end
end

@testset "detect plong" begin
    @testset "the sound for 7 is Plong" begin
      @test raindrops(7) == "Plong"
    end
    @testset "the sound for 14 is Plong as it has a factor of 7" begin
      @test raindrops(14) == "Plong"
    end
    @testset "the sound for 49 is Plong as it has a factor 7" begin
      @test raindrops(49) == "Plong"
    end
end

@testset "detect multiple sounds" begin
    @testset "the sound for 15 is PlingPlang as it has factors 3 and 5" begin
      @test raindrops(15) == "PlingPlang"
    end
    @testset "the sound for 21 is PlingPlong as it has factors 3 and 7" begin
      @test raindrops(21) == "PlingPlong"
    end
    @testset "the sound for 35 is PlangPlong as it has factors 5 and 7" begin
      @test raindrops(35) == "PlangPlong"
    end
    @testset "the sound for 105 is PlingPlangPlong as it has factors 3, 5 and 7" begin
      @test raindrops(105) == "PlingPlangPlong"
    end
end

Prepare submission

To submit your exercise, you need to save your solution in a file called raindrops.jl before using the CLI. You can either create it manually or use the following functions, which will automatically write every notebook cell that starts with # submit to the file raindrops.jl.



In [ ]:

    
# using Pkg; Pkg.add("Exercism")
# using Exercism
# Exercism.create_submission("raindrops")