Advent day 3 2 star finished

Author: Salsedini

src/day03.spec.ts

@@ -1,15 +1,24 @@
 import { expect, it, describe } from 'vitest'
 
-import { sumOfMultiplications} from '@/day03'
+import { sumOfMultiplications, sumOfMultiplicationsWithLimitations} from '@/day03'
 
 
 describe('it should solve day 3 correctly', () => {
-  it('should only consider the correct sentences adding its multiplications', () => {
+  it('should consider the correct sentences adding its multiplications', () => {
     // Arrange
     const stringToMatch = 'xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))'
     // Act
     const result = sumOfMultiplications(stringToMatch)
     // Assert
     expect(result).toEqual(161)
   })
+
+  it('should consider the correct sentences taking the do and dont instrucions into account', () =>{
+    // Arrange
+    const stringToMatch = "xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))"
+    // Act
+    const result = sumOfMultiplicationsWithLimitations(stringToMatch)
+    // Assert
+    expect(result).toEqual(48)
+  })
 })

src/day03.ts

@@ -23,4 +23,26 @@ export function sumOfMultiplications(text: string): number {
 return sumOfProducts
 }
 
+export function sumOfMultiplicationsWithLimitations(text: string): number{
+    const regex = /mul\((\d+),(\d+)\)|(don't\(\))|(do\(\))/g
+    let sumOfProducts = 0
+    let skipOrders = false
+    const matches = text.matchAll(regex)
+    for(const match of matches){
+        let firstIsNumber= !isNaN(Number(match[1]))
+        let secondtIsNumber= !isNaN(Number(match[2]))
+
+        if(match[3] === "don't()"){
+            skipOrders = true
+        }
+        if(match[4] === 'do()') {
+            skipOrders = false;
+        }
+        if(skipOrders === false && firstIsNumber && secondtIsNumber){
+            sumOfProducts += Number(match[1]) * Number(match[2])
+        }
+    }
+    return sumOfProducts
+}
+