Basic Syntax

Comments

• Comments can be single line or multi-line
  • Single line comment - // hello
  • Multi line comment - /* hello */
• Comments can nest

/* /* nested */ */

Identifiers

They can begin with _ or a letter and can contain letters, numbers and underscores.

Statements

Statements may be separated by semicolons but it is not compulsory

Blocks

They are declared using curly brackets

{
    let a = 'hello'
    print(a)
}

Int literals

• Int literals can be hex - 0x,octal - 0o
• They can have underscores between them
• Example: 0xdead_beef

Float literals

• They can contain underscores
• Exponential notation is also allowed
• Example: 1.2e9

String Literals

• They can start and end with ' or "
• They can be multi-line
• \t,\n,\r,\0 escape sequences can be used
• Unicode escape sequences begin with \u

  let sparklingHeart = "\u{1F496}" // 💖, Unicode scalar U+1F496
  

• They also allow interpolation using \ followed by an expression in parentheses

  let greeting = 'Hello \(name)!'