feat(2019-day-02): run multistep IntCode programs

Author: developher-net

2019/day-02/intcodeParser.js

@@ -1,14 +1,17 @@
 
 const add = ({ posIn1, posIn2, posOut, data }) => {
   data[posOut] = data[posIn1] + data[posIn2]
+  return true
 }
 
 const multiply = ({ posIn1, posIn2, posOut, data }) => {
   data[posOut] = data[posIn1] * data[posIn2]
+  return true
 }
 
-const terminate = ({ data }) => {
-  console.log('Reached terminator. Stopping.')
+const terminate = ({ position }) => {
+  console.log(`Reached terminator at position ${position}. Stopping.`)
+  return false
 }
 
 const step = ({ position, data }) => {
@@ -19,14 +22,25 @@ const step = ({ position, data }) => {
   }
   const segment = data.slice(position, position + 4)
   // Run the correct opcode for the specified step
-  opCodesMap[data[position]]({
+  return opCodesMap[data[position]]({
     posIn1: segment[1],
     posIn2: segment[2],
     posOut: segment[3],
-    data
+    data,
+    position
   })
 }
 
+const runProgram = ({ data }) => {
+  let position = 0
+  let running = true
+  while (running === true && position <= data.length) {
+    running = step({ position, data })
+    position += 4
+  }
+}
+
 module.exports = {
-  step
+  step,
+  runProgram
 }

2019/day-02/intcodeParser.test.js

@@ -41,7 +41,7 @@ describe('--- 2019 Day 2: 1202 Program Alarm ---', () => {
           [30, 1, 1, 4, 2, 5, 6, 0, 99]
         ]
         testInputs.forEach((data, idx) => {
-          runProgram(data)
+          runProgram({ data })
           expect(data).to.deep.equal(testOutputs[idx])
         })
       })