Short lambda macro #1

ShortLambdaMacroTest.hx

class  ShortLambdaMacroTest {
	static function other(i:Int){
		trace('ok, so $i');
	}

	static function using(){
		Lambda.iter([1,2,3], function(i){trace(i);});
		Lambda.iter([1,2,3], f(i => trace(i)));
		Lambda.iter([1,2,3], f(i => {trace(i + 1); other(i);}));
	}

	static macro function f(e){
		switch(e.expr){
			case EBinop(OpArrow, el, er):
				var argName = "";

				switch(el.expr){
					case EConst(CIdent(i)):
						argName = i;
					default: throw "Unexpected arg $el";
				}

				return macro function($argName){ return $er; };
			default: throw 'Unexpected $e';
		}
		throw false;
	}
}

+1

Can you please explain the trace on line 3? What is i?

First two Lambda.iter calls is same thing.
Left i (from arrow) - argument name.
Right i - using that name as identifier to call trace.

Line 3 is using string interpolation, i is an argument of the other function.

Oh, sorry, didn't see "line 3" part :)