26 lines
816 B
JavaScript
26 lines
816 B
JavaScript
|
const fs = require('fs');
|
||
|
|
const expressions = fs.readFileSync('./input.txt', 'utf-8').split('\n');
|
||
|
|
|
||
|
|
function calc (expression) {
|
||
|
|
// if it's just a number, do nothing
|
||
|
|
if (!isNaN(Number(expression))) { Number(expression) }
|
||
|
|
// if there's brackets, do that first
|
||
|
|
while (expression.match(/\(/)){
|
||
|
|
expression = expression.replace(/\([^()]+\)/, match =>
|
||
|
|
calc (match.slice(1, match.length-1))
|
||
|
|
)
|
||
|
|
}
|
||
|
|
// do all the calculations until it's just a number
|
||
|
|
while (isNaN(Number(expression))) {
|
||
|
|
expression = expression.replace(/(\d+) ([+*]) (\d+)/, (match, a, op, b) =>
|
||
|
|
op == '+' ? parseInt(a) + parseInt(b) : parseInt(a) * parseInt(b)
|
||
|
|
)
|
||
|
|
}
|
||
|
|
return Number(expression)
|
||
|
|
}
|
||
|
|
|
||
|
|
let runningTotal = 0
|
||
|
|
for (expression of expressions) {
|
||
|
|
runningTotal += calc (expression)
|
||
|
|
}
|
||
|
|
console.log(runningTotal)
|