I completed the algo successfully, but I'm not quite sure how it all works lol Codewars: https://www.codewars.com/kata/5a3dd29055519e23ec000074/solutions/javascript My Code:https://codepen.io/Ricecakes_95/pen/BaXeeMx?editors=0012 Primarily, I'm confused as to why my filter method has access to array2.. Because I'm calling the filter method on array1 so obviously the values and indices should be available for array1, but why can I access array2?? Is this some type of implied access? Like I understand, since array2 exists, and it has data from the argument, that I'll have some access to array2 within the functional or block scope, but I thought I wouldn't have scope to access array2 within the filter method.. What am I missing? Thanks in advance smart people 😄

I'm finally getting to the point where my answers are pretty similar to a lot of the algos top 1 or 2 answers. This is my first "one-liner" I've been able to do in the last 2 months. I'm getting away from for loops as I try to challenge myself to solve them using the Array methods instead as I'm pretty comfortable with for loops as long as they're not nested. That "j" index is scary lol This isn't a difficult Algo by any means, but I've seen some cool ways to solve algos since I've been grinding the last 2 weeks and wanted to try new ways to get to the same result. Codewars link if you're curious: https://www.codewars.com/kata/5648b12ce68d9daa6b000099/solutions/javascript The biggest win was remembering that in the .map method you can directly access your nested array's elements using this syntax: var number = function(busStops){ return busStops.map( ([on, off]) => on - off).reduce( (acc, cur) => acc +=cur) } console.log(number([[10,0],[3,5],[5,8]])) The kata 7s are now being solved pretty quickly as I get back up to speed with all the different ways to iterate/"open" arrays. Getting my head around needing an array, variable, and for loop for everything is now slowly fading as I'm learning the redundancies in my code from all the other answers. Soon I'll be on your "one liner" level @Adelin Rosca hahaha

Here's the algo: https://www.codewars.com/kata/55f2b110f61eb01779000053/train/javascript Here's my answer (it works!): https://codepen.io/Ricecakes_95/pen/mdNYQXz I'm sure its too complicated but I couldn't think of an easier solution, other than breaking it down into steps. Let me know if you figure out why I'm getting a fatal error on codewars. Thanks!

Hey guys, I see some answers being solved with double for loops in algos and so similar kind of question. I personally have only used this approach on an exercise a handful of times. But for those with more experience is this a concept I should become comfortable with? Thanks in advance!

So i'm still just grinding away at some algos until i'm constantly completing level 6s in a timely fashion to really hone in my iteration skills / thought processes before continuing on in React. Of course regex comes up a lot in algos but I haven't seen much real world use for them. Do you think it's worth learning the syntax so you can understand how to read regex or do you just google until you find one that works for you? Let me know!