Advent of Code 2023 - Day 1 - Salesforce Apex

Advent of Code has begun! I'll be completing this year's coding challenges using Apex. 

--- Day 1: Trebuchet?! ---

Let's dive into Day 1's challenge part 1. Setting up a reusable LWC Puzzle Input File Reader. And with Apex, I'll tackle the first part of the puzzle.

https://adventofcode.com/2023/day/1

Reusable LWC Puzzle Input File Reader

	<template>
	<lightning-card title="Puzzle File Reader">
	<div class="slds-p-around_medium">
	<lightning-input type="file" label="Select File" onchange={handlePuzzleInputChange}></lightning-input>
	{puzzleInputFileName}
	<div class="slds-p-top_small">
	<lightning-button label="Read Puzzle Input" onclick={uploadPuzzleInput} disabled={disabled}></lightning-button>
	</div>
	</div>
	</lightning-card>
	<lightning-card title="Puzzle Result">
	<div class="slds-p-around_medium">
	Answer: {puzzleAnswer}
	</div>
	</lightning-card>
	</template>

view raw AdventofCode_FileReader.html hosted with ❤ by GitHub

	import { LightningElement } from 'lwc';
	import readPuzzleInput from '@salesforce/apex/Advent.readPuzzleInput';
	export default class AdventofCode_FileReader extends LightningElement {
	puzzleInput;
	puzzleInputFileName;
	puzzleAnswer;
	handlePuzzleInputChange(event) {
	this.puzzleInput = event.target.files[0];
	this.puzzleInputFileName = event.target.files[0].name;
	}
	get disabled() {
	return this.puzzleInput ? false : true;
	}
	uploadPuzzleInput() {
	if (this.puzzleInput) {
	const reader = new FileReader();
	reader.onload = () => {
	const fileContent = reader.result;
	// process the puzzle input
	readPuzzleInput({ fileName: this.puzzleInput.name, fileContent })
	.then(result => {
	// Handle success
	console.log('File uploaded successfully:', result);
	this.puzzleAnswer = result;
	})
	.catch(error => {
	// Handle error
	console.error('Error uploading file:', error);
	});
	};
	reader.readAsText(this.puzzleInput);
	}
	}
	}

view raw AdventofCode_FileReader.js hosted with ❤ by GitHub

Reusable Puzzle Input Apex File Reader

	public with sharing class Advent {
	@AuraEnabled
	public static Integer readPuzzleInput(String fileName, String fileContent) {
	return read_lines(fileContent);
	}
	public static Integer read_lines(String puzzleInput) {
	// Split by newline chars
	List<String> lines = puzzleInput.split('\n');
	// call puzzle solution
	return day01.part1(lines);
	}
	}

view raw Advent.cls hosted with ❤ by GitHub

Day 01 Solution

	public with sharing class day01 {
	public static Map<String,String> numberMap = new Map<String,String>{
	'one' => '1',
	'two' => '2',
	'three' => '3',
	'four' => '4',
	'five' => '5',
	'six' => '6',
	'seven' => '7',
	'eight' => '8',
	'nine' => '9',
	'1' => '1',
	'2' => '2',
	'3' => '3',
	'4' => '4',
	'5' => '5',
	'6' => '6',
	'7' => '7',
	'8' => '8',
	'9' => '9'
	};
	public static Integer part1(List<String> puzzleInputLines) {
	System.debug(puzzleInputLines);
	Integer total = 0;
	for(String line : puzzleInputLines) {
	System.debug(line);
	String first = firstMatch(line);
	String last = lastMatch(line);
	String fullMatch = first + last;
	total += Integer.valueOf(fullMatch);
	}
	return total;
	}
	public static String firstMatch(String line) {
	String returnVal;
	// Iterate through each character in the line (first match)
	for (Integer i = 0; i < line.length(); i++) {
	// Get the character at the current index
	String currentChar = line.substring(i, i + 1);
	if(numberMap.get(currentChar) != null) {
	returnVal = numberMap.get(currentChar);
	break;
	}
	}
	return returnVal;
	}
	public static String lastMatch(String line) {
	String returnVal;
	// Iterate through each character in the line in reverse order (last match)
	for (Integer i = line.length() - 1; i >= 0; i--) {
	// Get the character at the current index
	String currentChar = line.substring(i, i + 1);
	if(numberMap.get(currentChar) != null) {
	returnVal = numberMap.get(currentChar);
	break;
	}
	}
	return returnVal;
	}
	}

view raw day01.cls hosted with ❤ by GitHub

Day 01 - Part 1 complete!

Day 01 - Part 2

Day 01 - Part 2 Solution

	public with sharing class day01 {
	public static Map<String,String> numberMap = new Map<String,String>{
	'one' => '1',
	'two' => '2',
	'three' => '3',
	'four' => '4',
	'five' => '5',
	'six' => '6',
	'seven' => '7',
	'eight' => '8',
	'nine' => '9',
	'1' => '1',
	'2' => '2',
	'3' => '3',
	'4' => '4',
	'5' => '5',
	'6' => '6',
	'7' => '7',
	'8' => '8',
	'9' => '9'
	};
	public static Integer part2(List<String> puzzleInputLines) {
	System.debug(puzzleInputLines);
	Integer total = 0;
	for(String line : puzzleInputLines) {
	System.debug(line);
	String fullMatch = matchIncludingSpelledOutNumbers(line);
	total += Integer.valueOf(fullMatch);
	}
	return total;
	}
	public static String matchIncludingSpelledOutNumbers(String line) {
	List<String> returnVal = new List<String>();
	// Iterate through each character in the line (first match)
	for (Integer i = 0; i < line.length(); i++) {
	// Get the character string at the current index to the end
	String currentChars = line.substring(i, line.length());
	for(String numKey : numberMap.keySet()) {
	// check if starts with matches a key in the spelled out number map
	if(currentChars.startsWith(numKey)) {
	returnVal.add(numberMap.get(numKey));
	}
	}
	}
	return returnVal[0] + returnVal[returnVal.size() - 1];
	}
	}

view raw day01.cls hosted with ❤ by GitHub

Day 01 - Part 2 complete!