in-op.rn

# with Array
var arr = [1,2,3,4,5]

# with if-else
if 1 in arr {
    print("Data found.")
} else {
    print("Not found.")
}

# Normal testing
print(2 in arr)

# with while loop
while 3 in arr {
    print(arr_pop(arr))
}

# this should also work for HashMap as well.
arr = [1,2,3,4,5]
assert 4 in arr

const hm = {
    "key1": "value1",
    "key2": "value2"
}
assert "key2" in hm # This will search in HashMap->Keys

class Person {
    fun __constructor__(name) {
        this.name = name
        this.friends = []
    }

    fun befriend(other) {
        arr_append(this.friends, other)
        arr_append(other.friends, this)
    }

    fun dump() {
        print("Person(name=\"" + this.name + "\", friends=" + this.friends + ")")
    }

    fun __contains__(friend_name) {
        for friend in this.friends {
            if friend.name == friend_name {
                return true
            }
        }
        return false
    }
}

const john = Person("John")
const bob = Person("Bob")
const alice = Person("Alice")

john.befriend(bob)
assert "Bob" in john
assert "John" in bob
assert not "Alice" in john