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Commit5f8d4d4

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[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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functionCompress(str){
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letcompressed=''
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letcount=1
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for(leti=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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returncompressed
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}
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functionDecompress(str){
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letdecompressed=''
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letmatch=[...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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returndecompressed
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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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