IWasBored

"I was bored" is a toy programming language which looks like Swift and written in Swift. I started it because I was bored, but also to learn more about lexers, parsers, ASTs and all the stuff needed to write an interpreter.

Current state of IWB:

// String concatenation
var str = "hello"
print(str + ", " + "world") // --> hello, world

// Basic math
var expr = (3 + 3) * 3 / -4.5 * (12 - -3.234)
print(expr) // --> -60.936

// Variable shadowing
var redefineMe = 1234
var redefineMe = "redefined"
print(redefineMe) // --> redefined

// Constant value
const tryChangingMe = 100
tryChangingMe = 500 // -> Runtime error

// Global and local scopes
var a = 12
{
  var a = a * 3.14
  {
    var a = "inner a"
    print(a) // --> inner a
  }
  print(a) // --> 37.68
}
print(a) // --> 12

// Equality checks
print(1 > 2) // --> false
print(1 >= 1) // --> true
print(1 < 5) // --> true
print(10 <= 5) // --> false
print(true == false) // --> false
print(false == false) // --> true
print(false == nil) // --> false
print(nil == nil) // --> true
print("0" == 0) // --> false
print("hello" == "hello") // --> true

// Branching with if
if 5 >= 5 {
  print("5 is greater or equal to 5") // --> 5 is greater or equal to 5
}

// Branching with if-else
if false {
  print("it is true")
} else if 15 < 6 {
  print("15 < 7")
} else {
  print("it is not") // --> it is not
}

// Operator maybe randomly picks left or right operand
print(1 maybe 2) // --> prints 1 or 2

// while loop
var i = 10
while i > 0 { 
  print(i)
  i = i - 1
}