Afraid not - you can do a lot of value conversion using ArrayBuffers though.
a = new Uint8Array(2); b = new Int16Array(a.buffer); b[0] = 12345; console.log(a);
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Afraid not - you can do a lot of value conversion using ArrayBuffers though.