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algorithm: letter combinations#1209
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raklaptudirm merged 4 commits intoTheAlgorithms:masterfromhiitesh1127:hiitesh1127-patch-2Oct 21, 2022
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| /* | ||
| * | ||
| * Letter Combinations of a Phone Number | ||
| * | ||
| * Given a string containing digits from 2-9 inclusive, | ||
| * return all possible letter combinations that the number could represent. | ||
| * Return the answer in any order. | ||
| * A mapping of digits to letters (just like on the telephone buttons) is given below. | ||
| * Note that 1 does not map to any letters. | ||
| * More info: https://leetcode.com/problems/letter-combinations-of-a-phone-number/ | ||
| */ | ||
| /* | ||
| * @param {string} digits | ||
| * @returns {string[]} all the possible combinations | ||
| */ | ||
| const letterCombinations = (digits) => { | ||
| const length = digits?.length | ||
| const result = [] | ||
| if (!length) { | ||
| return result | ||
| } | ||
| const digitMap = { | ||
| 2: 'abc', | ||
| 3: 'def', | ||
| 4: 'ghi', | ||
| 5: 'jkl', | ||
| 6: 'mno', | ||
| 7: 'pqrs', | ||
| 8: 'tuv', | ||
| 9: 'wxyz' | ||
| } | ||
| const combinations = (index, combination) => { | ||
| let letter | ||
| let letterIndex | ||
| if (index >= length) { | ||
| result.push(combination) | ||
| return | ||
| } | ||
| const digit = digitMap[digits[index]] | ||
| letterIndex = 0 | ||
| while ((letter = digit[letterIndex++])) { | ||
| combinations(index + 1, combination + letter) | ||
| } | ||
| } | ||
| combinations(0, '') | ||
| return result | ||
| } | ||
| export { letterCombinations } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| import { letterCombinations } from '../LetterCombination' | ||
| describe('Letter Combinations', () => { | ||
| it('should return empty array if provided string is not valid', () => { | ||
| const result = letterCombinations('') | ||
| expect(Array.isArray(result)).toBe(true) | ||
| expect(result.length).toBe(0) | ||
| }) | ||
| it('should return empty array if provided string is empty', () => { | ||
| const result = letterCombinations(null) | ||
| expect(Array.isArray(result)).toBe(true) | ||
| expect(result.length).toBe(0) | ||
| }) | ||
| it('should return letter combination of 234', () => { | ||
| const result = letterCombinations('234') | ||
| expect(result).toEqual([ | ||
| 'adg', | ||
| 'adh', | ||
| 'adi', | ||
| 'aeg', | ||
| 'aeh', | ||
| 'aei', | ||
| 'afg', | ||
| 'afh', | ||
| 'afi', | ||
| 'bdg', | ||
| 'bdh', | ||
| 'bdi', | ||
| 'beg', | ||
| 'beh', | ||
| 'bei', | ||
| 'bfg', | ||
| 'bfh', | ||
| 'bfi', | ||
| 'cdg', | ||
| 'cdh', | ||
| 'cdi', | ||
| 'ceg', | ||
| 'ceh', | ||
| 'cei', | ||
| 'cfg', | ||
| 'cfh', | ||
| 'cfi' | ||
| ]) | ||
| }) | ||
| }) |
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