Cyan Programming Language

Cyan. A high-level, functional programming language with syntax focused on readability.

Current features

• NoneType, String, Number and Boolean datatype
• variables
• binary and unary operations
• if/else expressions
• while loops
• functions
• lambda functions
• comments

Usage

Pre-requiestes: git and python3 (3.10 or above)

Commands

To get Cyan in your machine, download the latest release or run

git clone https://github.com/was07/Cyan

Start the Cyan shell with python -m cyan. To see other options, use python -m cyan --help

To run a file: use python -m cyan filename.cy.

For devs: Add -d for developer mode.

Example Code

Repl example

Cyan 1.1.0 shell on win32
>>> out("cy"+'an')
cyan
none
>>> fun square(n) {n ** 2}
<Function square>
>>> square(6)
36
>>> let a = 1
1

Code example

out('Guess the number.')
let target = 3
while Num(inp()) != target {
    out('Try again.')
}
out('You got it.')

Output

Guess the number.
6
Try again.
4
Try again.
3
You got it.

Docs (in progress)

Datatypes available

Data type	Converter	Literal examples
String	Str()	'ab', "cd"
Number	Num()	1, 2.45, 1. (.1 is invalid)
Boolean	Bool()	true, false
None		none

Build-in Functions available

Build-in Function	parameters	Usage
out()	values*	make standard output. Joins all values with a single space, if there is more than one
inp()		Takes standard input and returns Str object

Functions

Functions are constructed with the fun keyword. They are also first-class objects, can be passed as arguments to other functions.

fun plus(a, b) {  # multiple parameters possible
    out(a + b)
}

plus(2, 3)

If-Else Blocks

There are if, then, and else keywords to use to make a if-else block. They can be single or multiliner.

out(if Num(inp()) > 0 then 'Positive' else 'Negative')  # single-line example

if Num(inp()) > 0 then {  # multi-line example
    out('Positive')
} else {
    out('Negative')
}

While Loops

while makes while loops.

out('Guess the number.')
let target = 3
while Num(inp()) != target {  # while loop
    out('Try again.')
}
out('You got it.')