Array Week Challenge - Day 4

Array Week Challenge - Day 4

Going up?

Oct 11, 2022·

3 min read

Hello! Another day, another challenge. LET'S GO!

⏰ There's still time!

Today marks halfway through this challenge week, and there's always time to catch up.

This week so far:

⭐ Array Week

This week our challenges all deal with Arrays! Their purpose is to store a collection of things under a single reference name, but the way they are set up and used in JavaScript is a little different from other programming languages. If you're coming from a different language, be sure to check out what's different! While working on our challenges, feel free to use JavaScript's built-in Array methods.

🏆 The Challenge - Day 4

This week we'll be working with arrays toward a final puzzling result on Friday when we combine our daily functions. Your solutions should be built to work within any given daily constraints.

Imagine, if you will, an array with length X, with each of its entries having X number of primitives as their entries. Now imagine it arranged as a grid.

// for the less imaginative among us :) 

// as a grid

Still with me? I hope so! Today I need your help moving some things around again. I'm always rearranging.

Please write twin functions that each take in a given value that will only appear once within a given array of a similar structure to the one described above, which will either move that value up one row or down one row in the array, keeping its same horizontal position. It will essentially swap places with whatever was where it needed to be. Just like in Day 2, don't do anything if the given value is already as high or low as it can get.

Oh, and go ahead and mutate the given array. We're livin' on the wild side!


myGrid = [['a', 'b', 'c'], ['d', 'e', 'f'], ['g', 'h', 'i']]

// call move up function with 'h' and myGrid
console.log(myGrid) = [['a', 'b', 'c'], ['d', 'h', 'f'], ['g', 'e', 'i']]

// call move up function again, same arguments
console.log(myGrid) = [['a', 'h', 'c'], ['d', 'b', 'f'], ['g', 'e', 'i']]

// call move up function again, same arguments
// Note that 'h' is already as far up as it can go
console.log(myGrid) = [['a', 'h', 'c'], ['d', 'b', 'f'], ['g', 'e', 'i']]

// call move down function this time, with 'f' and myGrid as arguments
console.log(myGrid) = [['a', 'h', 'c'], ['d', 'b', 'i'], ['g', 'e', 'f']]

// call move down function again, same arguments
// Note that 'f' is already as far down as it can go
console.log(myGrid) = [['a', 'h', 'c'], ['d', 'b', 'i'], ['g', 'e', 'f']]

Good luck, see you tomorrow!

Wait, What's Huntober?

Leon Noel's 100Devs are spending October preparing for the job hunt. Anyone who has already broken into a tech career knows that the application and interview process can be grueling! The current cohort has progressed this year all the way from basic HTML files to hosted full-stack applications with authentication and databases.

This month they'll continue to build, but will also work on data structures & algorithms, networking and interview skills, and solving code challenges.