Javascript typed variables name/syntax/reference?

Question

I am trying to find the reference on how to declare typed variables in JavaScript. I know I've seen it somwhere, but I cannot find any reference for it, nor can I remember the "correct" term for it. e.g.:

var name: string = "Ian Boyd";

I don't know if I saw it on the IEBlog, and it was in the works for the next version of Javascript
I don't know if it's something only available in "use strict" mode
I don't know if it's something that's been available for a while

All I know is that I saw it; and I'm not crazy.

Ry- · Accepted Answer · 2012-01-08 00:11:32Z

5

No, that syntax doesn't exist in pure JavaScript. JavaScript is a loosely-typed language, even in ECMAScript 5 strict mode.

You may have seen it in ActionScript, a relative of JavaScript used in Flash scripting:

var someVariable:TypeName = someValue;

function someFunc():ReturnType {
}

// etc.

is all valid in ActionScript. ActionScript also has classes.

answered Jan 8, 2012 at 0:11

Ry-♦

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