The Vivian REPL is a Console Text Editor with some basic controls:
- PgUp: Cycle up through submission history
- PgDn: Cycle down through submission history
- End: Moves the cursor to the last character in the sequence
- Home: Moves the cursor to the first character in the sequence
- Arrow Keys: Used for navigating around the text
- Tab: 4 space indent
- Enter: Submits current input
- Input will only be submitted if the cursor is not within a scope (between {} curly brackets)
- Ctrl Enter: Used to continue the expression on a new line (ex -> 12 + \n 4)Vivian is currently an implicitly typed language. It contains:
boolintstringobject- basic expression evaluation, and
- an early implementation of functions
{
// data types
int: whole numbers
bool: true/false
string: "sentences encased in double quotes"
object: unboxed object that can represent any type
// built-in conversions
int(string input) // converts a string to an int, if a valid integer is given.
string(int input) // converts an int to a string.
bool(string/int input) // converts either string or int to bool.
object(object input) // converts anything to an unboxed object implicitly.
// variable declaration types
var result = 20 // imply represents a mutable variable
const result = 20 // let represents a constant varable
// Remember, variables cannot be redeclared.
// for loop
for i = 0 to 100
{
result = result + i
}
// if/else if/else statements
if result <= 200
{
result = 0
}
else if result == 20
{
result = 0
}
else
{
result = 9000
}
// while loop
while result < 20
{
result = result - 1
result = result + 1
}
// do while loop
do
{
result = result + 1
} while result < 25
// built-in functions
print(string output)
input(string input)
rnd(int max)
// custom function declaration
function name(param: string, other: int)
{
// your code goes here!
}
// custom function example
function myPrint(text: string, number: int) {
print(text)
print(string(number))
}
// calling custom functions
myPrint("Hello, myPrint!", 100)
}{
var message = " "
for i = 0 to 100
{
if i % 3 == 0
message = "fizz"
else if i % 5 == 0
message = "buzz"
else if i % 3 == 0 && i % 5 == 0
message = "fizzbuzz"
else
message = string(i)
print(message)
}
}{
var factor = true
while factor == true
{
print("I'm thinking of a number between 0 and 10")
var answer = input()
var num = rnd(10)
if int(answer) == num
{
print("Congrats!, the number I was thinking of was " + num)
factor = false
}
else
print("not quite!")
}
}function randomFunctionOne()
{
print("I am random function number one.")
print("Congrats on picking me!")
}
function randomFunctionTwo()
{
print("I am random function number two.")
print("Pleased to make your acquaintance.")
}
function randomFunctionThree()
{
print("Howdy, I'm rando function numba three!")
print("YEEEEEHAW")
}
{
const randomNumber = rnd(2) + 1
if randomNumber == 1
randomFunctionOne()
else if randomNumber == 2
randomFunctionTwo()
else if randomNumber == 3
randomFunctionThree()
}