add stuff form last year (gave up quickly)

2023/03/index.ts

@@ -0,0 +1,58 @@
+const args = Bun.argv.slice(2)
+
+if(args.length !== 1) {
+    console.error('Please, provide an input file')
+    process.exit(1)
+}
+
+const filename = args[0];
+
+
+const input = Bun.file(filename)
+const text = await input.text()
+
+let count = 0
+let prevNums: Array<[string, number]> = []
+let prevSyms: Array<[number, string[]]> = []
+text.split('\n').forEach(ln => {
+    const line = ln.trim()
+    if(!line) return
+
+    let tokens = line.matchAll(/\d+|\*/g)
+
+    let nums: Array<[string, number]> = [], syms: Array<[number, string[]]> = []
+    for(const token of tokens) {
+        /\d/.test(token.toString()) ?
+            nums.push([token.toString(), token.index as number]) :
+            syms.push([token.index as number, []])
+    }
+
+
+    pushNums(prevSyms, nums)
+        .map(([_index, attached]) => attached)
+        .filter(attached => attached.length == 2)
+        .forEach(attached => {
+            count += attached
+                .map(e => parseInt(e))
+                .reduce((a = 1, b = 1) => a * b, 1)
+        })
+
+    syms = pushNums(syms, nums)
+    syms = pushNums(syms, prevNums)
+
+    prevNums = nums
+    prevSyms = syms
+})
+
+console.log(count)
+
+function pushNums(symbols: Array<[number, string[]]>, nums: Array<[string, number]>): [number, string[]][] {
+    return symbols.map(([index, attached]) => {
+        attached.push(
+            ...nums.filter(([num, nindex]) => {
+                return index >= nindex - 1 && index <= nindex + num.length
+            }).map(([num]) => num)
+        )
+        return [index, attached]
+    })
+}