| 1 | | // |
| 2 | | // This is only a SKELETON file for the 'Beer Song' exercise. It's been provided as a |
| 3 | | // convenience to get you started writing code faster. |
| 4 | | // |
| 5 | | |
| 6 | | /** |
| 7 | | * @param {number} initialBottlesCount |
| 8 | | * @param {number} takeDownCount |
| 9 | | * @return {string[]} |
| 1 | /* |
| 2 | * Generates the lyrics for the '99 Bottles of Beer' song. |
| 3 | * Handles special cases like singular/plural bottles, zero bottles, and the final restart verse. |
| 4 | * |
| 5 | * @param {number} initialBottlesCount - The starting number of bottles (0-99) |
| 6 | * @param {number} takeDownCount - How many verses to generate (default: 1) |
| 7 | * @return {string[]} - Array of verses, each verse is two lines |
| 10 | 8 | */ |
| 11 | 9 | export const recite = (initialBottlesCount, takeDownCount = 1) => { |
| 12 | | throw new Error('Remove this line and implement the function'); |
| 10 | // Edge Case: Invalid input types |
| 11 | if (typeof initialBottlesCount !== 'number' || typeof takeDownCount !== 'number') { |
| 12 | throw new Error('Both parameters must be numbers'); |
| 13 | } |
| 14 | |
| 15 | // Edge Case: Negative numbers |
| 16 | if (initialBottlesCount < 0 || takeDownCount < 0) { |
| 17 | throw new Error('Parameters must be non-negative'); |
| 18 | } |
| 19 | |
| 20 | // Edge Case: takeDownCount of 0 returns empty array |
| 21 | if (takeDownCount === 0) { |
| 22 | return []; |
| 23 | } |
| 24 | |
| 25 | const verses = []; |
| 26 | |
| 27 | for (let i = 0; i < takeDownCount; i++) { |
| 28 | const currentBottles = initialBottlesCount - i; |
| 29 | |
| 30 | // Edge Case: Current bottles count goes below 0 |
| 31 | if (currentBottles < 0) { |
| 32 | break; |
| 33 | } |
| 34 | |
| 35 | let line1, line2; |
| 36 | |
| 37 | // Handle special cases for different bottle counts |
| 38 | if (currentBottles === 0) { |
| 39 | // Edge Case: No more bottles |
| 40 | line1 = 'No more bottles of beer on the wall, no more bottles of beer.'; |
| 41 | line2 = 'Go to the store and buy some more, 99 bottles of beer on the wall.'; |
| 42 | } else if (currentBottles === 1) { |
| 43 | // Edge Case: One bottle |
| 44 | line1 = '1 bottle of beer on the wall, 1 bottle of beer.'; |
| 45 | line2 = 'Take it down and pass it around, no more bottles of beer on the wall.'; |
| 46 | } else if (currentBottles === 2) { |
| 47 | // Edge Case: Two bottles (transition from plural to singular) |
| 48 | line1 = '2 bottles of beer on the wall, 2 bottles of beer.'; |
| 49 | line2 = 'Take one down and pass it around, 1 bottle of beer on the wall.'; |
| 50 | } else { |
| 51 | // Edge Case: Standard plural case (3 or more bottles) |
| 52 | line1 = `${currentBottles} bottles of beer on the wall, ${currentBottles} bottles of beer.`; |
| 53 | line2 = `Take one down and pass it around, ${currentBottles - 1} bottles of beer on the wall.`; |
| 54 | } |
| 55 | |
| 56 | verses.push(line1, line2); |
| 57 | |
| 58 | // Edge Case: After reaching 0 bottles, don't add an extra newline if this is the last verse |
| 59 | if (currentBottles === 0 && i < takeDownCount - 1) { |
| 60 | verses.push(''); // Add blank line between verses, except after the last verse |
| 61 | } else if (currentBottles > 0 && i < takeDownCount - 1) { |
| 62 | verses.push(''); // Add blank line between verses |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | // Handled Edge Cases: Invalid input types, negative numbers, takeDownCount of 0, |
| 67 | // current bottles count going below 0, no more bottles, one bottle, |
| 68 | // two bottles (transition from plural to singular), standard plural case, |
| 69 | // proper spacing between verses |
| 70 | return verses; |
| 13 | 71 | }; |