cond macro

gistfile1.js

macro _arms {
  case (default => $value:expr) => {
		else {
			return $value;
		}
	}
	case (case $cond:expr => $value:expr) => {
		if($cond) {
			return $value;
		}
	}
	case (
		$(case $cond:expr => $value:expr) $rest ...
	) => {
		_arms (case $cond => $value)
		_arms ($rest ...)
	}
}
macro cond {
	case { $arms ... } => {
		(function() {
			_arms($arms ...)
		})();
	}
}

var x = [];
var type = cond {
	case (x === null) => "null"
	case Array.isArray(x) => "array"
	case (typeof x === "object") => "object"
	default => typeof x
}