Mascara JavaScript compiler Blog

Version 0.3.6 is now released. Numerous improvements:

static initializer blocks and static methods are now supported correctly. They work basically like in Java.

Array type literals are supported. They have an interesting syntax:

var a : [...int] = [1,2,3]; // a variable size array of integers
var b : [int, int, int] = [1,2,3]; //a fixed size array of three integers.

So the three dots mean "any number of". Fixed sized arrays can be heterogenous:

var c : [int, String, boolean] = [7, "hello", false];

And believe it or not, an array can even be a combination of heterogeneous types and variable size:

var d : [boolean, String, ...int] = [true, "hello", 1, 2, 3];

The first two items are boolean and String, end every item after is int.

Destructuring variable definitions is also supported now. This allows you to write:

var [a, b] = [1,2];

This is especially useful when returning arrays from a function, e.g.:

function f() { return [1, 2]; }
var [a,b] = f();