Add exercise: luhn

[MatthijsBlom]

Add the Luhn exercise for Slimline September.

[MatthijsBlom]

I'd rather have

Suggested change

	run jq -r -f luhn.jq << 'END_INPUT'
	{
	"value": "1"
	}
	END_INPUT
	run jq -r -f luhn.jq '"1"'

but I did not spot a way to accomplish this through generate_tests.json.

[glennj]

Yes, I wrote generate_tests to grab the canonical-data "input" verbatim. Have a look at the generate_tests.json file, if you would prefer to simplify the bats file and omit this exercise from the test generator.

And jq -r -f luhn.jq '"1"' would give an error

jq: error: Could not open file "1": No such file or directory

You'd want one of

run jq -r -f luhn.jq <<< '"1"'
# or pass into jq as a variable
run jq -r -f luhn.jq --arg input 1

[glennj]

Yes, I wrote generate_tests to grab the canonical-data "input" verbatim. Have a look at the generate_tests.json file, if you would prefer to simplify the bats file and omit this exercise from the test generator.

And jq -r -f luhn.jq '"1"' would give an error

jq: error: Could not open file "1": No such file or directory

You'd want one of

run jq -r -f luhn.jq <<< '"1"'
# or pass into jq as a variable
run jq -r -f luhn.jq --arg input 1

[glennj]

Very nice!
I'd put the try into the function, but I can do that in my own solution.

[MatthijsBlom]

The try inside of parse_digit? I'm not seeing how that could work out correctly.

[glennj]

You'll just have to wait and see :)

[glennj]

This can come out of Draft status for merging, yes?

[MatthijsBlom]

I'm aiming to look at the tests' formatting tomorrow, and then undraft.

[glennj]

Thank you @MatthijsBlom!