My Erlang solution to the dev.to Daily Challenge #19.
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To try:
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2> words:test().
All 1010 tests passed.
ok
3> words:test_words(51, 60).
All 10 tests passed.
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| 726 seven hundred and twenty-six | |
| 727 seven hundred and twenty-seven | |
| 728 seven hundred and twenty-eight | |
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| 730 seven hundred and thirty | |
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| 737 seven hundred and thirty-seven | |
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| 739 seven hundred and thirty-nine | |
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| 745 seven hundred and forty-five | |
| 746 seven hundred and forty-six | |
| 747 seven hundred and forty-seven | |
| 748 seven hundred and forty-eight | |
| 749 seven hundred and forty-nine | |
| 750 seven hundred and fifty | |
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| 756 seven hundred and fifty-six | |
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| 776 seven hundred and seventy-six | |
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| 780 seven hundred and eighty | |
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| 998 nine hundred and ninety-eight | |
| 999 nine hundred and ninety-nine |
| -module( words ). | |
| -export( [ num_to_words/1, test_words/2 ] ). | |
| -include_lib("eunit/include/eunit.hrl"). | |
| words() -> #{ | |
| units => [ | |
| "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", | |
| "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" | |
| ], | |
| tens => [ "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety" ] | |
| }. | |
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| lists:nth( N, maps:get( Cat, words() ) ). | |
| join_num_words( _, 0 ) -> | |
| ""; | |
| join_num_words( Joint, N ) -> | |
| Joint ++ num_to_words( N ). | |
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| word( N, units ); | |
| num_to_words( N ) when N < 100 -> | |
| word( N div 10, tens ) ++ join_num_words( "-", N rem 10 ); | |
| num_to_words( N ) when N < 1000 -> | |
| word( N div 100, units ) ++ " hundred" ++ join_num_words( " and ", N rem 100 ). | |
| % TESTS | |
| num_to_words_test_() -> [ | |
| ?_assertEqual( "one", num_to_words( 1 ) ), | |
| ?_assertEqual( "four", num_to_words( 4 ) ), | |
| ?_assertEqual( "ten", num_to_words( 10 ) ), | |
| ?_assertEqual( "twelve", num_to_words( 12 ) ), | |
| ?_assertEqual( "twenty", num_to_words( 20 ) ), | |
| ?_assertEqual( "forty-two", num_to_words( 42 ) ), | |
| ?_assertEqual( "one hundred", num_to_words( 100 ) ), | |
| ?_assertEqual( "one hundred and one", num_to_words( 101 ) ), | |
| ?_assertEqual( "one hundred and fifty-six", num_to_words( 156 ) ), | |
| ?_assertEqual( "eight hundred and sixty-five", num_to_words( 865 ) ), | |
| ?_assertEqual( "nine hundred and ninety-nine", num_to_words( 999 ) ) | |
| ]. | |
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| { ok, File } = file:open( Filename, [ read, { encoding, utf8 } ] ), | |
| read_file( File ). | |
| read_file( File ) -> | |
| read_file( File, file:read_line( File ), [] ). | |
| read_file( File, eof, Lines ) -> | |
| ok = file:close( File ), | |
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| read_file( File, { ok, Line }, Lines ) -> | |
| { Num, Rest } = string:to_integer( Line ), | |
| Words = string:trim( Rest ), | |
| read_file( File, file:read_line( File ), [ { Num, Words } | Lines ] ). | |
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| test_words( Start, End ) -> | |
| eunit:test( gen_tests( Start, End ) ). | |
| gen_tests( Start, End ) -> { | |
| generator, | |
| fun() -> | |
| [ | |
| ?_assertEqual( Words, num_to_words( Num ) ) || | |
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| Num >= Start, | |
| Num =< End | |
| ] | |
| end | |
| }. |