day 17 part 1 finished

2024/17/example.txt

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+Register A: 729
+Register B: 0
+Register C: 0
+
+Program: 0,1,5,4,3,0

2024/17/index.js

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+import fs from 'node:fs'
+
+
+function main(filename) {
+    const file = fs.readFileSync(filename, { encoding: "utf-8" }, data => data).split('\n')
+    const set = new Map(file.filter(line => line != '').map(str => str.split(':')))
+    let computer = new Computer()
+    computer.program = set.get('Program').trim().split(',').map(Number)
+    computer.registers.A = parseInt(set.get('Register A').trim())
+    computer.registers.B = parseInt(set.get('Register B').trim())
+    computer.registers.C = parseInt(set.get('Register C').trim())
+    computer.run(computer.program)
+}
+class Computer {
+    constructor() {
+        this.registers = { A: 0, B: 0, C: 0 }
+        this.output = []
+        this.program = []
+        this.ip = 0
+        this.ops = 0
+    }
+
+    getCombo(operand) {
+        switch (operand) {
+            case 4: return this.registers.A;
+            case 5: return this.registers.B;
+            case 6: return this.registers.C;
+            case 7: return 0
+        }
+        return operand
+    }
+    doOperations(opcode, operand) {
+        this.ops++
+        switch (opcode) {
+            case 0:
+                this.registers.A = Math.floor(this.registers.A / Math.pow(2, this.getCombo(operand)))
+                break       // division by operand^2
+            case 1:
+                this.registers.B = (this.registers.B ^ operand); break                              // bitwise XOR literal operand
+            case 2:
+                this.registers.B = (this.getCombo(operand) % 8); break                              //mod8 combo operand
+            case 3:
+                if (this.registers.A !== 0) {
+                    this.ip = operand
+                    return true
+                }
+                break
+            case 4:
+                this.registers.B = (this.registers.B ^ this.registers.C);
+                break       // bitwise XOR
+            case 5:
+                this.output.push((this.getCombo(operand) % 8));
+                break                  // output combo
+            case 6:
+                this.registers.B = Math.floor(this.registers.A / Math.pow(2, this.getCombo(operand)));
+                break
+            case 7:
+                this.registers.C = Math.floor(this.registers.A / Math.pow(2, this.getCombo(operand)));
+                break
+            default: break
+        }
+        return false
+    }
+    run(program) {
+
+        while (this.ip < program.length) {
+            let opcode = program[this.ip]
+            let operand = program[this.ip + 1]
+            const jumped = this.doOperations(opcode, operand)
+            if (!jumped) this.ip += 2
+        }
+        console.log(this)
+        console.log(this.output.join(","))
+    }
+}
+
+main('input.txt')

2024/17/input.txt

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+Register A: 64584136
+Register B: 0
+Register C: 0
+
+Program: 2,4,1,2,7,5,1,3,4,3,5,5,0,3,3,0