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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".

You can run all the tests for an exercise by entering

$ gradle test

in your terminal.

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

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