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Commit 5f8d4d4

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ddaniel27appgurueu
andauthored
[Compressor] RLE Compressor implementation (#1671)
* [Solution] Project euler challenge 19 with tests * update leap year function * Remove unnecessary, confusingly placed comments * [COMPRESSOR] RLE * [COMPRESSOR] RLE style fixed --------- Co-authored-by: Lars Müller <34514239+appgurueu@users.noreply.github.com>
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‎Compression/RLE.js‎

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/*
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* RLE (Run Length Encoding) is a simple form of data compression.
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* The basic idea is to represent repeated successive characters as a single count and character.
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* For example, the string "AAAABBBCCDAA" would be encoded as "4A3B2C1D2A".
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*
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* @author - [ddaniel27](https://github.com/ddaniel27)
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*/
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function Compress(str) {
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let compressed = ''
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let count = 1
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for (let i = 0; i < str.length; i++) {
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if (str[i] !== str[i + 1]) {
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compressed += count + str[i]
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count = 1
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continue
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}
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count++
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}
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return compressed
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}
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function Decompress(str) {
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let decompressed = ''
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let match = [...str.matchAll(/(\d+)(\D)/g)] // match all groups of digits followed by a non-digit character
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match.forEach((item) => {
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let [count, char] = [item[1], item[2]]
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decompressed += char.repeat(count)
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})
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return decompressed
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}
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export { Compress, Decompress }

‎Compression/test/RLE.test.js‎

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import { Compress, Decompress } from '../RLE'
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describe('Test RLE Compressor/Decompressor', () => {
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it('Test - 1, Pass long repetitive strings', () => {
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expect(Compress('AAAAAAAAAAAAAA')).toBe('14A')
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expect(Compress('AAABBQQQQQFG')).toBe('3A2B5Q1F1G')
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})
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it('Test - 2, Pass compressed strings', () => {
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expect(Decompress('14A')).toBe('AAAAAAAAAAAAAA')
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expect(Decompress('3A2B5Q1F1G')).toBe('AAABBQQQQQFG')
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})
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})

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