Colon in JavaScript statement

Question

The following code is extracted from SharePoint's SP.UserProfiles.debug.js library.

    getUserProfilePropertiesFor: function (d) {
    a: ;
    var b = this.get_context(),
    a,
    c = new SP.ClientActionInvokeMethod(this, "GetUserProfilePropertiesFor", [d]);
    b.addQuery(c);
    a = [];
    b.addQueryIdAndResultObject(c.get_id(), a);
    return a
}

What does the "a: ;" on second line mean? When I step-through in IE Developer tool, that line was skipped right through. But it also does not look like a label as it has a semi-colon at the end.

Huh, I'd never seen this before, but apparently it can be used to label a statement... Here's some more about it on MDN. — Alexander Nied
– Alexander Nied, Commented Aug 2, 2017 at 2:18
Why would a semi-colon mean that it was not a label? It's a label on an empty statement. — user663031
– user663031, Commented Aug 2, 2017 at 2:23
At first I thought it was minified code and some kind of marker for the minification. But then I saw it came from a file ending in *.debug.js and was horrified to think that was unminified code! Dear gods tell me they don't actually code their variable names like that! — Sukima
– Sukima, Commented Aug 2, 2017 at 2:46

basarat · Accepted Answer · 2017-08-02 05:39:55Z

3

What does the "a: ;" on second line mean?

It is a label statement : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/label

answered Aug 2, 2017 at 5:39

basarat

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