algorithm/JavaScript
1
0
Fork 0
mirror of https://github.com/TheAlgorithms/JavaScript.git synced 2025-07-08 03:45:23 +08:00
Code Issues Packages Projects Releases Wiki Activity

fix: added reverse string inplace (#1406)

Browse Source 
Co-authored-by: madhuredra <madhuredra.tiwari@zemosolabs.com>
This commit is contained in:
Madhurendra Nath Tiwari
2023-10-02 23:06:45 +05:30
committed by GitHub
parent 36dcff8c5d
commit 0ca18c2b2c
2 changed files with 14 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
String/ReverseString.js
View File

@ -16,24 +16,17 @@ function ReverseStringIterative (string) {
} }
/** /**
* JS disallows string mutation so we're actually a bit slower.
* *
* @complexity O(n) * @author dev-madhurendra
* Reverses a number by converting it to a string.
*
* @param {string} str - The number to reverse.
* @returns {string} The reversed number.
*
* @example
* const reversed = reverseString("hello"); // Returns olleh
*/ */
function ReverseStringIterativeInplace (string) {
if (typeof string !== 'string') {
throw new TypeError('The given value is not a string')
}
const _string = string.split('') const ReverseStringIterativeInplace = (str) => [...str].reverse().join('')
for (let i = 0; i < Math.floor(_string.length / 2); i++) {
const first = _string[i]
_string[i] = _string[_string.length - 1 - i]
_string[_string.length - 1 - i] = first
}
return _string.join('')
}
export { ReverseStringIterative, ReverseStringIterativeInplace } export { ReverseStringIterative, ReverseStringIterativeInplace }

31
String/test/ReverseString.test.js
View File

@ -35,31 +35,10 @@ describe('ReverseStringIterative', () => {
}) })
describe('ReverseStringIterativeInplace', () => { describe('ReverseStringIterativeInplace', () => {
it('expects to reverse a simple string', () => { it.each([
expect(ReverseStringIterativeInplace('reverse')).toEqual('esrever') ['hello', 'olleh'],
expect(ReverseStringIterativeInplace('some')).toEqual('emos') ['word', 'drow']
expect(ReverseStringIterativeInplace('string')).toEqual('gnirts') ])('reverse of %s is %s', (value, expected) => {
expect(ReverseStringIterativeInplace('The Algorithms Javascript')).toEqual('tpircsavaJ smhtiroglA ehT') expect(ReverseStringIterativeInplace(value)).toBe(expected)
}) })
it('expects to reverse a simple string without capitalizing the first letter', () => {
expect(ReverseStringIterativeInplace('Javascript')).toEqual('tpircsavaJ')
})
it('expects to return an empty string given an empty string', () => {
expect(ReverseStringIterativeInplace('Javascript')).toEqual('tpircsavaJ')
})
it.each`
input
${123456}
${[1, 2, 3, 4, 5, 6]}
${{ test: 'test' }}
${null}
`(
'expects to throw a type error given a value that is $input',
({ input }) => {
expect(() => ReverseStringIterativeInplace(input)).toThrow('The given value is not a string')
}
)
}) })