Advent of Code 2024

Attempting in Go this year

How to Run

Run the code using go run .

Specify the day using the -d flag (default is 1)

$ go run . -d 4

Specify a part using the -p flag and a 1 or 2 (default is 1)

$ go run . -p 2

Specify the input file using the -f flag (default is "input.txt")

$ go run . -f "example.txt"

Example - Run Day 5 Part 2 with the example input

$ go run . -d 5 -p 2 -f "example.txt"

Notes

Utils

The utils package contains a ReadInput() function with 2 params:

• filename - the default is the input file, which should be saved under the given day and named input.txt (e.g. dayX/input.txt). These files have been .gitignored as is standard for AoC. Alternatively it will read the passed -f flag under the same directory (e.g. dayX/myOtherFile.txt)
• linefn - a function to run based on each line that is read. This is where the input file is read into whatever data format is necessary for the given puzzle.

I have found this format to be effective for abstracting the reading of the file while providing flexibility for different input structures and problem statements.

Testing

Added a test suite so that if I change the utils I can confirm that the earlier runs still function as expected.

To use it, run either:

$ go test
$ go test -v

Since my specific input files are not available publicly, the -example flag can be applied to run the test suite against the example text files in the same manner:

$ go test -example
$ go test -v -example