test_call = fn () {
    ret = fn(){[1,fn(){[4,5,6]},3]}()[1]()[1]
    assert(ret == 5)
}

test_undefined = fn () {
    assert(undefined == undefined)
    assert(!(undefined != undefined))

    a = undefined
    assert(a == undefined)
    assert(!(a != undefined))
    assert(!(a <= undefined))
    assert(!(a < undefined))
    assert(!(a >= undefined))
    assert(!(a > undefined))
    assert(undefined == a)
    assert(!(undefined != a))
    assert(!(undefined <= a))
    assert(!(undefined < a))
    assert(!(undefined >= a))
    assert(!(undefined > a))
}

test_closure = fn () {
    make_func = fn (mut x) {
        mut n = 100
        fn () {
            n = n + 1
            x = x + 1 + n
        }
    }

    f = make_func(10)
    f()
    f()
    ret = f()

    assert(ret == 319)
}

test_array = fn () {
    a = [1,2,3]
    assert(a.size() == 3)

    a.push(4)
    assert(a.size() == 4)

    b = []
    assert(b.size() == 0)
}

g_ = 1

test_function = fn () {
    a = 1
    make = fn () {
        b = 1
        fn (c) {
            g_ + a + b + c
        }
    }
    f = make()
    assert(f(1) == 4)
}

test_object = fn () {
    n = 1
    o = {
    	n: 123,
    	s: 'str',
    	f1: fn (x) { x + this.n },
    	f2: fn (x) { x + n }
    }
    assert(o.size() == 4)
    assert(o.f1(10) == 133)
    assert(o.f2(10) == 11)
}

test_object_factory = fn () {
    ctor = fn (init) {
        mut n = init

        {
            add: fn (x) {
                n = n + x
            },
            sub: fn (x) {
                n = n - x
            },
            val: fn () {
                n
            }
        }
    }

    calc = ctor(10)

    assert(calc.val() == 10)
    assert(calc.add(1) == 11)
    assert(calc.sub(1) == 10)
}

test_sum = fn () {
    mut i = 1
    mut ret = 0
    while i <= 10 {
        ret = ret + i
        i = i + 1
    }

    assert(ret == 55)
}

test_fib = fn () {
    fib = fn (x) {
        if x < 2 {
            x
        } else {
            self(x - 2) + self(x -1)
        }
    }

    ret = fib(15)

    assert(ret == 610)
}

test_interpolated_string = fn () {
    hello = "Hello"
	world = "World!"
    ret = "{hello} {world}"
    assert(ret == 'Hello World!')
}

test_call()
test_closure()
test_undefined()
test_array()
test_function()
test_object()
test_object_factory()
test_sum()
test_fib()
test_interpolated_string()