Brat is a little toy language that just doesn't care.

Brat uses a PEG parser written using TreeTop, a Ruby parser generator. The Brat code is compiled to Lua.

Brat is flexible enough that you can get by with a very small core and write any functionality that most languages use keywords for. For example, you can write and use a while loop like so:

#Loops until the block returns false
while = { block |
    true? block, { while ->block }
}

n = 1
while {
    p n
    n = n + 1
    n < 10
}

If you would rather have your conditions be separated out, you could define it this way instead:

#Loops until condition is false
while = { condition, block |
    true? condition, { block; while ->condition, ->block }
}   

n = 1 
while { n < 10 } { p n; n = n + 1 }

Features

• Typeless, and pretty much classless
• Everything is object, except functions
• And functions are closures, which can be attached to objects to make methods
• Objects use a prototyping system and are completely open
• Built in hash tables and dynamic arrays
• Very flexible unary and binary operators
• Tail calls are optimized to make infinite loops faster (and more infinite)