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fix(challenges): Add tests and solution for Project Euler problem 17 (#16685)

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Added a couple of additional tests and a working solution for this
problem.

BREAKING CHANGE: None
This commit is contained in:
Kristofer Koishigawa
2018-02-15 18:04:01 +09:00
committed by Stuart Taylor
parent 8cdc783378
commit 4a3d1c9dce
1 changed files with 6 additions and 4 deletions
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10
challenges/08-coding-interview-questions-and-take-home-assignments/project-euler-problems.json
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@ -744,17 +744,19 @@
"type": "bonfire", "type": "bonfire",
"title": "Problem 17: Number letter counts", "title": "Problem 17: Number letter counts",
"tests": [ "tests": [
"assert.strictEqual(euler17(), 21124, 'message: <code>euler17()</code> should return 21124.');" "assert.strictEqual(numberLetterCounts(5), 19, 'message: <code>numberLetterCounts(5)</code> should return 19.');",
"assert.strictEqual(numberLetterCounts(150), 1903, 'message: <code>numberLetterCounts(150)</code> should return 1903.');",
"assert.strictEqual(numberLetterCounts(1000), 21124, 'message: <code>numberLetterCounts(1000)</code> should return 21124.');"
], ],
"solutions": [], "solutions": ["function numberLetterCounts(limit) {\n const dictionary = {\n 0: '',\n 1: 'one',\n 2: 'two',\n 3: 'three',\n 4: 'four',\n 5: 'five',\n 6: 'six',\n 7: 'seven',\n 8: 'eight',\n 9: 'nine',\n 10: 'ten',\n 11: 'eleven',\n 12: 'twelve',\n 13: 'thirteen',\n 14: 'fourteen',\n 15: 'fifteen',\n 16: 'sixteen',\n 17: 'seventeen',\n 18: 'eighteen',\n 19: 'nineteen',\n 20: 'twenty',\n 30: 'thirty',\n 40: 'forty',\n 50: 'fifty',\n 60: 'sixty',\n 70: 'seventy',\n 80: 'eighty',\n 90: 'ninety',\n 1000: 'onethousand'\n };\n\n let numString = '';\n\n function convertToString(num) {\n // check dictionary for number\n if (dictionary[num]) {\n return dictionary[num];\n } else {\n const hundreds = Math.floor(num / 100);\n const tens = Math.floor((num / 10) % 10) * 10;\n const remainder = num % 10;\n\n let tempStr = '';\n\n if (hundreds === 0) {\n tempStr += dictionary[tens] + dictionary[remainder];\n } else {\n tempStr += dictionary[hundreds] + 'hundred';\n\n if (tens !== 0 || remainder !== 0) {\n tempStr += 'and';\n }\n\n if (tens < 20) {\n const lessThanTwenty = tens + remainder;\n tempStr += dictionary[lessThanTwenty];\n } else {\n tempStr += dictionary[tens] + dictionary[remainder];\n }\n }\n // console.log(num, hundreds, tens, remainder);\n return tempStr;\n }\n }\n\n for (let i = 1; i <= limit; i++) {\n numString += convertToString(i);\n }\n return numString.length;\n}"],
"translations": {}, "translations": {},
"challengeSeed": [ "challengeSeed": [
"function euler17() {", "function numberLetterCounts(limit) {",
" // Good luck!", " // Good luck!",
" return true;", " return true;",
"}", "}",
"", "",
"euler17();" "numberLetterCounts(5);"
], ],
"description": [ "description": [
"If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total.", "If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total.",