3.1 KiB
3.1 KiB
id | challengeType | title |
---|---|---|
5900f37d1000cf542c50fe90 | 5 | Problem 17: Number letter counts |
Description
limit
inclusive were written out in words, how many letters would be used?
NOTE: 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.
Instructions
Tests
tests:
- text: <code>numberLetterCounts(5)</code> should return 19.
testString: assert.strictEqual(numberLetterCounts(5), 19, '<code>numberLetterCounts(5)</code> should return 19.');
- text: <code>numberLetterCounts(150)</code> should return 1903.
testString: assert.strictEqual(numberLetterCounts(150), 1903, '<code>numberLetterCounts(150)</code> should return 1903.');
- text: <code>numberLetterCounts(1000)</code> should return 21124.
testString: assert.strictEqual(numberLetterCounts(1000), 21124, '<code>numberLetterCounts(1000)</code> should return 21124.');
Challenge Seed
function numberLetterCounts(limit) {
// Good luck!
return true;
}
numberLetterCounts(5);
Solution
function numberLetterCounts(limit) {
const dictionary = {
0: '',
1: 'one',
2: 'two',
3: 'three',
4: 'four',
5: 'five',
6: 'six',
7: 'seven',
8: 'eight',
9: 'nine',
10: 'ten',
11: 'eleven',
12: 'twelve',
13: 'thirteen',
14: 'fourteen',
15: 'fifteen',
16: 'sixteen',
17: 'seventeen',
18: 'eighteen',
19: 'nineteen',
20: 'twenty',
30: 'thirty',
40: 'forty',
50: 'fifty',
60: 'sixty',
70: 'seventy',
80: 'eighty',
90: 'ninety',
1000: 'onethousand'
};
let numString = '';
function convertToString(num) {
// check dictionary for number
if (dictionary[num]) {
return dictionary[num];
} else {
const hundreds = Math.floor(num / 100);
const tens = Math.floor((num / 10) % 10) * 10;
const remainder = num % 10;
let tempStr = '';
if (hundreds === 0) {
tempStr += dictionary[tens] + dictionary[remainder];
} else {
tempStr += dictionary[hundreds] + 'hundred';
if (tens !== 0 || remainder !== 0) {
tempStr += 'and';
}
if (tens < 20) {
const lessThanTwenty = tens + remainder;
tempStr += dictionary[lessThanTwenty];
} else {
tempStr += dictionary[tens] + dictionary[remainder];
}
}
// console.log(num, hundreds, tens, remainder);
return tempStr;
}
}
for (let i = 1; i <= limit; i++) {
numString += convertToString(i);
}
return numString.length;
}