fn map<T, U>(anon array: [T], function: fn(anon x: T) -> U) throws -> [U] {
    mut result: [U] = []
    result.ensure_capacity(array.size())
    for item in array {
        result.push(value: function(item))
    }
    return result
}

fn main() {
    let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    let array_squared = map(array, function: fn(anon n: i64) => n * n)
    println("{}", array_squared)
}