79d9012432
* fix(curriculum): tests quotes * fix(curriculum): fill seed-teardown * fix(curriculum): fix tests and remove unneeded seed-teardown
135 lines
3.1 KiB
Markdown
135 lines
3.1 KiB
Markdown
---
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id: 5900f37d1000cf542c50fe90
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challengeType: 5
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title: 'Problem 17: Number letter counts'
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---
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## Description
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<section id='description'>
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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.
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If all the numbers from 1 to given <code>limit</code> inclusive were written out in words, how many letters would be used?
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<b>NOTE:</b> Do not count spaces or hyphens. For example, 342 (three hundred and forty-two) contains 23 letters and 115 (one hundred and fifteen) contains 20 letters. The use of "and" when writing out numbers is in compliance with British usage.
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>numberLetterCounts(5)</code> should return 19.
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testString: assert.strictEqual(numberLetterCounts(5), 19, '<code>numberLetterCounts(5)</code> should return 19.');
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- text: <code>numberLetterCounts(150)</code> should return 1903.
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testString: assert.strictEqual(numberLetterCounts(150), 1903, '<code>numberLetterCounts(150)</code> should return 1903.');
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- text: <code>numberLetterCounts(1000)</code> should return 21124.
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testString: assert.strictEqual(numberLetterCounts(1000), 21124, '<code>numberLetterCounts(1000)</code> should return 21124.');
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function numberLetterCounts(limit) {
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// Good luck!
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return true;
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}
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numberLetterCounts(5);
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function numberLetterCounts(limit) {
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const dictionary = {
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0: '',
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1: 'one',
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2: 'two',
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3: 'three',
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4: 'four',
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5: 'five',
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6: 'six',
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7: 'seven',
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8: 'eight',
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9: 'nine',
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10: 'ten',
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11: 'eleven',
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12: 'twelve',
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13: 'thirteen',
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14: 'fourteen',
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15: 'fifteen',
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16: 'sixteen',
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17: 'seventeen',
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18: 'eighteen',
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19: 'nineteen',
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20: 'twenty',
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30: 'thirty',
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40: 'forty',
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50: 'fifty',
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60: 'sixty',
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70: 'seventy',
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80: 'eighty',
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90: 'ninety',
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1000: 'onethousand'
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};
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let numString = '';
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function convertToString(num) {
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// check dictionary for number
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if (dictionary[num]) {
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return dictionary[num];
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} else {
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const hundreds = Math.floor(num / 100);
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const tens = Math.floor((num / 10) % 10) * 10;
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const remainder = num % 10;
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let tempStr = '';
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if (hundreds === 0) {
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tempStr += dictionary[tens] + dictionary[remainder];
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} else {
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tempStr += dictionary[hundreds] + 'hundred';
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if (tens !== 0 || remainder !== 0) {
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tempStr += 'and';
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}
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if (tens < 20) {
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const lessThanTwenty = tens + remainder;
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tempStr += dictionary[lessThanTwenty];
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} else {
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tempStr += dictionary[tens] + dictionary[remainder];
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}
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}
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// console.log(num, hundreds, tens, remainder);
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return tempStr;
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}
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}
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for (let i = 1; i <= limit; i++) {
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numString += convertToString(i);
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}
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return numString.length;
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}
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```
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</section>
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