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Merge pull request knaxus#23 from marcelinol/add-test-for-string-permutation

Add test for string permutation

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README.md
src/_Problems_
- get-string-permutations
  - get-string-permutations.test.js
  - index.js
- get_string_permutations
  - index.js

4 files changed

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-25

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`‎README.md‎`

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Original file line number	Diff line number	Diff line change
`@@ -32,7 +32,7 @@ Collection of interview questions with Unit Tests. Problems includes Data Struct`
`32`	`32`	`- [Find 2 numbers that add upto N](src/_Problems_/find-2-nums-adding-to-n)`
`33`	`33`	`- [Find 2nd Maxinum from an Array](src/_Problems_/find-2nd-max)`
`34`	`34`	`- [FizzBuzz](src/_Problems_/fizzbuzz)`
`35`		`-- [String Permutaions](src/_Problems_/get_string_permutations)`
	`35`	`+- [String Permutaions](src/_Problems_/get-string-permutations)`
`36`	`36`	`- [Get Subsequence](src/_Problems_/get_subsequence)`
`37`	`37`	`- [Get Maze Path](src/_Problems_/get_subsequence)`
`38`	`38`	`- [Get longest consecutive 1s](src/_Problems_/max-consecutive-1s)`

`‎src/_Problems_/get-string-permutations/get-string-permutations.test.js‎`

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`@@ -0,0 +1,38 @@`
	`1`	`+const { getPermutations } = require('.');`
	`2`	`+`
	`3`	`+describe('Get permutations of a string', () => {`
	`4`	`+ it('returns permutations of a short string', () => {`
	`5`	`+ const shortString = 'ab';`
	`6`	`+ const expectedPermutations = ['ab', 'ba'];`
	`7`	`+`
	`8`	`+ expect(getPermutations(shortString)).toEqual(expectedPermutations);`
	`9`	`+ });`
	`10`	`+`
	`11`	`+ it('returns permutations of a long string', () => {`
	`12`	`+ const shortString = 'XUNDA';`
	`13`	+ const expectedPermutations = ['XUNDA', 'UXNDA', 'NXUDA', 'XNUDA', 'UNXDA', 'NUXDA', 'DUXNA', 'UDXNA', 'XDUNA', 'DXUNA', 'UXDNA', 'XUDNA', 'XNDUA', 'NXDUA', 'DXNUA', 'XDNUA', 'NDXUA', 'DNXUA', 'DNUXA', 'NDUXA', 'UDNXA', 'DUNXA', 'NUDXA', 'UNDXA', 'ANDXU', 'NADXU', 'DANXU', 'ADNXU', 'NDAXU', 'DNAXU', 'XNADU', 'NXADU', 'AXNDU', 'XANDU', 'NAXDU', 'ANXDU', 'ADXNU', 'DAXNU', 'XADNU', 'AXDNU', 'DXANU', 'XDANU', 'XDNAU', 'DXNAU', 'NXDAU', 'XNDAU', 'DNXAU', 'NDXAU', 'UDXAN', 'DUXAN', 'XUDAN', 'UXDAN', 'DXUAN', 'XDUAN', 'ADUXN', 'DAUXN', 'UADXN', 'AUDXN', 'DUAXN', 'UDAXN', 'UXADN', 'XUADN', 'AUXDN', 'UAXDN', 'XAUDN', 'AXUDN', 'AXDUN', 'XADUN', 'DAXUN', 'ADXUN', 'XDAUN', 'DXAUN', 'NXAUD', 'XNAUD', 'ANXUD', 'NAXUD', 'XANUD', 'AXNUD', 'UXNAD', 'XUNAD', 'NUXAD', 'UNXAD', 'XNUAD', 'NXUAD', 'NAUXD', 'ANUXD', 'UNAXD', 'NUAXD', 'AUNXD', 'UANXD', 'UAXND', 'AUXND', 'XUAND', 'UXAND', 'AXUND', 'XAUND', 'DAUNX', 'ADUNX', 'UDANX', 'DUANX', 'AUDNX', 'UADNX', 'NADUX', 'ANDUX', 'DNAUX', 'NDAUX', 'ADNUX', 'DANUX', 'DUNAX', 'UDNAX', 'NDUAX', 'DNUAX', 'UNDAX', 'NUDAX', 'NUADX', 'UNADX', 'ANUDX', 'NAUDX', 'UANDX', 'AUNDX'];
	`14`	`+`
	`15`	`+ expect(getPermutations(shortString).sort()).toEqual(expectedPermutations.sort());`
	`16`	`+ });`
	`17`	`+`
	`18`	`+ it('returns the same string if the string is one character long', () => {`
	`19`	`+ const shortString = 'a';`
	`20`	`+ const expectedPermutations = ['a'];`
	`21`	`+`
	`22`	`+ expect(getPermutations(shortString)).toEqual(expectedPermutations);`
	`23`	`+ });`
	`24`	`+`
	`25`	`+ it('returns an empty array for an empty string', () => {`
	`26`	`+ const shortString = '';`
	`27`	`+ const expectedPermutations = [];`
	`28`	`+`
	`29`	`+ expect(getPermutations(shortString)).toEqual(expectedPermutations);`
	`30`	`+ });`
	`31`	`+`
	`32`	`+ it('is case sensitive', () => {`
	`33`	`+ const shortString = 'aB';`
	`34`	`+`
	`35`	`+ expect(getPermutations(shortString)).not.toEqual(['ab', 'ba']);`
	`36`	`+ expect(getPermutations(shortString)).toEqual(['aB', 'Ba']);`
	`37`	`+ });`
	`38`	`+});`

`‎src/_Problems_/get-string-permutations/index.js‎`

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	`1`	`+// GET PERMUTATION OF A GIVEN STRING`
	`2`	`+`
	`3`	`+const getPermutations = (str) => {`
	`4`	`+ let result = [];`
	`5`	`+`
	`6`	`+ if (str.length == 0) {`
	`7`	`+ return result;`
	`8`	`+ }`
	`9`	`+`
	`10`	`+ if (str.length == 1) {`
	`11`	`+ result.push(str);`
	`12`	`+ return result;`
	`13`	`+ }`
	`14`	`+`
	`15`	`+ let currentCharacter = str.charAt(0);`
	`16`	`+ let restOfString = str.substring(1);`
	`17`	`+ let returnResult = getPermutations(restOfString);`
	`18`	`+`
	`19`	`+ for (j = 0; j < returnResult.length; j++) {`
	`20`	`+ for (i = 0; i <= returnResult[j].length; i++) {`
	`21`	`+ let value = returnResult[j].substring(0, i) + currentCharacter + returnResult[j].substring(i);`
	`22`	`+ result.push(value);`
	`23`	`+ }`
	`24`	`+ }`
	`25`	`+`
	`26`	`+ return result;`
	`27`	`+};`
	`28`	`+`
	`29`	`+module.exports = { getPermutations };`

`‎src/_Problems_/get_string_permutations/index.js‎`

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`‎README.md‎`

`‎src/_Problems_/get-string-permutations/get-string-permutations.test.js‎`

`‎src/_Problems_/get-string-permutations/index.js‎`

`‎src/_Problems_/get_string_permutations/index.js‎`

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