Given a string, compress substrings of repeated characters in to a format similar to aaa -> a3

For example for the string aaabbhhhh33aaa the expected output would be a3b2h432a3

You must accept the input as a command line argument (entered when your app is ran) and print out the result

(It will be called like node main.js aaaaa or however else to run apps in your language)

You can use the solution tester in this post to test you followed the correct format https://programming.dev/post/1805174

Any programming language may be used. 1 point will be given if you pass all the test cases with 1 bonus point going to whoevers performs the quickest and 1 for whoever can get the least amount of characters

To submit put the code and the language you used below

People who have completed the challenge:

  •  brie   ( @brie@beehaw.org ) 
    3•1 year ago

    JavaScript (DenoBun): bun easy.js aaabbhhhh33aaa

    Golf attempt using RegExp to match homogenous substrings.

    Original version 
    console.log(Deno.args[0].replace(/(.)\1*/g,a=>a[0]+(a.length+'')))

    Slightly optimised by removing the frivolous conversion to string. I also made a somewhat silly opitmisation of using Bun.argv instead of Deno.args to save a character.

    console.log(Bun.argv[2].replace(/(.)\1*/g,a=>a[0]+a.length))