day1_part1.jakt

/// Expect:
/// - output: "569\n"

import reader

function main() {
    mut frequency: i32 = 0

    for change in reader::lines_string(day: 1).iterator() {
        mut number = change.substring(start: 1, length: change.length()-1).to_int()

        if number.has_value() {
            match change.substring(start: 0, length: 1) {
                "+" => { 
                    frequency += number!
                }
                else => {
                    frequency -= number!
                }
            }
        }   
    }

    println("{}", frequency)
}