list := []int

x := 1
while x <= 1000 {
    list.append(x)
    assertEq(list.reduce(fn(tot: int, a: int) -> int {
        return tot + a
    }, 0), x*(x + 1)/2)

    x = x + 1
}

fn sum(a: int, b: int) -> int {
    return a + b
}

list = []int
x = 1
while x <= 100 {
    list.append(2*x - 1)
    assertEq(list.reduce(sum, 0), x*x)

    x = x + 1
}

# list concatenation
assertEq([1, 2] + [3], [1, 2, 3])
assertEq(["Eny", "meanie"] + ["minie", "moe"], ["Eny", "meanie", "minie", "moe"])

# string splitting
assertEq("abcd".split(""), ["a", "b", "c", "d"])
assertEq("the, first, time".split(", "), ["the", "first", "time"])

# list indexing
assertEq([1, 2, 3].at(1), 2)
assertEq(["a", "b", "c"].at(2), "c")