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Added HammingDistance.js and HammingDistance.test.js in String directory #635

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Merged
raklaptudirm merged 1 commit into from
Jul 12, 2021
Merged

Added HammingDistance.js and HammingDistance.test.js in String directory #635

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32 changes: 32 additions & 0 deletions String/HammingDistance.js
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/**
* Hamming Distance: https://en.wikipedia.org/wiki/Hamming_distance
*
*
* Hamming distance is a metric for comparing two binary data strings.
*
* While comparing two binary strings of equal length, Hamming distance
* is the number of bit positions in which the two bits are different.
* The Hamming distance between two strings, a and b is denoted as d(a,b)
*/

/**
* @param {string} a
* @param {string} b
* @return {number}
*/

export const hammingDistance = (a, b) => {
if (a.length !== b.length) {
throw new Error('Strings must be of the same length')
}

let distance = 0

for (let i = 0; i < a.length; i += 1) {
if (a[i] !== b[i]) {
distance += 1
}
}

return distance
}
21 changes: 21 additions & 0 deletions String/test/HammingDistance.test.js
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import { hammingDistance } from '../HammingDistance'

test('should throw an error when trying to compare the strings of different length', () => {
const compareStringsOfDifferentLength = () => {
hammingDistance('abc', 'abcd')
}

expect(compareStringsOfDifferentLength).toThrowError()
})

test('should calculate difference between two strings', () => {
expect(hammingDistance('a', 'a')).toBe(0)
})

test('should calculate difference between two strings', () => {
expect(hammingDistance('abc', 'add')).toBe(2)
})

test('should calculate difference between two strings', () => {
expect(hammingDistance('1011101', '1001001')).toBe(2)
})