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Added algorithm CheckHeterogram#1221
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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 +1,40 @@ | ||
| // A [Heterogram](https://en.wikipedia.org/wiki/Heterogram_(literature)) is a word, phrase or sentence in which no letter of the alphabet occurs more than once. | ||
| /** | ||
| * @function checkHeterogram | ||
| * @param {string} str | ||
| * @returns {boolean} | ||
| * @description - check if a string is a heterogram | ||
| * @example - checkHeterogram('hero') => true | ||
| * @example - checkHeterogram('CoMpUtEr') => true | ||
| * @example - checkHeterogram('Great work!!') => true | ||
| * @example - checkHeterogram('Aba') => false | ||
| */ | ||
| const checkHeterogram = (str) => { | ||
| // Check that input is a string | ||
| if (typeof str !== 'string') { | ||
| throw new TypeError('Argument not a string.') | ||
| } | ||
| // initialize a hashmap where the letters of the string will be checked for duplicates | ||
| const letters = new Map() | ||
| // Check all the characters in the string by looping through it | ||
| for (let i = 0; i < str.length; i++) { | ||
| // If the character is a letter check whether it is a duplicate | ||
| if (str.charAt(i).match(/[a-z]/gi)) { | ||
| // If the letter exists in the hashmap already return false else store it in the hashmap | ||
| if (letters.has(str.charAt(i).toLowerCase())) { | ||
| return false | ||
| } else { | ||
| letters.set(str.charAt(i).toLowerCase()) | ||
| } | ||
| } | ||
| } | ||
| // Once all characters of the string have been checked return true | ||
| return true | ||
| } | ||
| export { checkHeterogram } |
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 +1,31 @@ | ||
| import { checkHeterogram } from '../CheckHeterogram' | ||
| describe('Testing checkHeterogram', () => { | ||
| it('expects to throw type error if given a non string argument', () => { | ||
| expect(() => checkHeterogram(0)).toThrow() | ||
| }) | ||
| it('expects to throw type error if given a non string argument', () => { | ||
| expect(() => checkHeterogram(true)).toThrow() | ||
| }) | ||
| it('expects to return true if the argument is a heterogram', () => { | ||
| expect(checkHeterogram('hero')).toBe(true) | ||
| }) | ||
| it('expects to return true if the given argument only contains non-alphabetic characters', () => { | ||
| expect(checkHeterogram('!!..&& ??22')).toBe(true) | ||
| }) | ||
| it('expects to return true if the given string is a heterogram which contains duplicate non-alphabetic characters', () => { | ||
| expect(checkHeterogram('C, o, m, p, u, t, e, r!!')).toBe(true) | ||
| }) | ||
| it('expects to return true if the given string is empty', () => { | ||
| expect(checkHeterogram('')).toBe(true) | ||
| }) | ||
| it('expects to return true if the given string contains multiple spaces and is a heterogram', () => { | ||
| expect(checkHeterogram('Cwm fjord bank glyphs vext quiz')).toBe(true) | ||
| }) | ||
| it('expects to return false if the given string contains duplicate letters with differing case (case insensitive)', () => { | ||
| expect(checkHeterogram('Ada')).toBe(false) | ||
| }) | ||
| it('expects to return false if the given string contains duplicate letters in different words', () => { | ||
| expect(checkHeterogram('List duplicates')).toBe(false) | ||
| }) | ||
| }) |
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