myriad

Install this vscode extension for syntax highlight

Declarations

• Variables

  let name = "Roshan Acharya";
  

• Constants

  const name = "Roshan Acharya";
  

Comments

• Singleline

  // This is a single line comment
  

• Multiline

  /*
      This is a multi line comment
  */
  

Data Types

• String

  let name = "Roshan Acharya";
  

• Number

  let age = 100;
  

• Boolean

  let x = false;
  let y = true;
  

• Null

  let n = null;
  

• Objects

  let age = 100;
  
  let obj = { name: "Roshan Acharya", age };
  
  print(obj.name);
  print(obj.age);
  

• Arrays

  let arr = ["Roshan", 100, true, false, null];
  
  print(arr[0]);
  print(arr[1]);
  

If Statements

let val;

if (x > 0) {
  val = "positive";
 else if (x < 0) {
  val = "negative";
} else {
  val = "equal";
}

print(val);

Curly braces are optional of body has single statement

let val;

if (x > 0) val = "positive";
else if (x < 0) val = "negative";
else val = "equal";

print(val);

Also parenthesis are optional in test condition.

let val;

if x > 0
  val = "positive";
else if x < 0
  val = "negative";
else
  val = "equal";

print(val);

Function Statements

func log(val){
    print(val);
}

Funcions return last expression by default

func add(x, y){
    x + y;
}

Or you can use the return keyword

func add(x, y){
    return x + y;
}

Function Expressions

You can define functions as a expressions too. Similar to function statements without function name.

const add = func (x, y) {
  return x + y;
}

Loops

• While

  let x = 0;
  
  while (x < 20) {
    if (x == 10) continue;
  
    const y = calculateY(x);
  
    if (y == null) break;
  
    print("Value of x is: ", x);
  
    x++;
  }
  

• For

  for (let i = 0; i < 20; i++) {}
  

Try Catch

try {
  const x = calculateValue();

  if (x == null) {
    throw "Something went wrong";
  }
} catch (err) {
  print(err);
}

Import and Export

• export

  func add(x, y) {
    x + y;
  }
  
  func sub(x, y) {
    x - y;
  }
  
  export { add, sub };
  

• import

  You can import both builtin module and file using import

  import "vector" vec; // builtin module
  
  import "./ops.myriad" ops; // custom file
  
  const sum = ops.add(1, 2);
  
  const vec = vec.create(2, 4);
  

String methods

• length

  let name = "Roshan";
  
  print(name.length()); // 6
  

• split

  let name = "Roshan Acharya";
  
  print(name.split(" ")); // ["Roshan", "Acharya"]
  

• replace

  let name = "Roshan".replace("R", "r"); // roshan
  

• uppercase

  let name = "Roshan";
  
  print(name.uppercase()); // ROSHAN
  

• lowercase

  let name = "Roshan";
  
  print(name.lowercase()); // roshan
  

Array methods

• length

  print([1, 2, 3].length()); // 3
  

• join

  print([1, 2, 3].join("-")); // 1-2-3
  

• pop

  ["a", "b", "c"].pop(); // c
  

• push

  ["a", "b", "c"].push("d"); // 4
  

• includes

  [1, 2, 3].includes(2); // true
  

• foreach

  [1, 2, 3].forEach(func (val, i) {
    print(val, i);
  })
  

Global Functions

• format

  format("My Name is {}", "Roshan");
  

• print

  print("Hello World");
  

• input

  input("> Enter your age ");
  

• typeof

  typeof(34);
  

Global Objects

Math

• rand
• abs
• ceil
• floor
• round
• cos
• sin
• tan

Json

• stringify

  json.stringify(obj);
  

• parse

  json.parse(str);
  

dt

• now

  dt.now();
  

• date

  const date = dt.date("2000-01-01");
  
  date.date();
  date.year();
  date.month();
  

http

• server

  const server = http.server(func (req, res){
  
      if(req.url == "/json") {
          res.set_header("Content-Type", "application/json");
  
          const msg = json.stringify({ message: "Hello World" });
          res.send(msg);
  
          return;
      }
  
      if(req.method == "POST") {
        const body = json.parse(req.body);
  
        res.send("Your name is: " + body.name);
  
        return;
      }
  
      print(req.headers);
  
      res.send("Hello World");
  })
  
  server.listen(3000);
  
  print("Listening on port 3000");
  

fs

• write

  fs.write("file.txt", "Hello");
  

• read

  fs.read("file.txt");
  

• stat

  fs.stat("file.txt");
  

• mkdir

  fs.mkdir("testdir");
  

• readdir

  fs.readdir("testdir");
  

• rmrf

  fs.rmrf("directory");
  

run_node

• run

  run_node.run(`console.log("Hello")`);