Assign javascript object property a value via string value on another object

Question

I'm trying to assign myShuttle.command to a string called signIn which is being stored in the shuttleCommands function.

function buildAndLaunchSignInShuttle (credentialsDoc) {
    var myShuttle = new shuttle();
    myShuttle.command = shuttleCommands.signIn;
    myShuttle.document = credentialsDoc;
    var responseObject = server.launchShuttle(myShuttle);

    return responseObject;
}

function shuttleCommands() {
    return {
        signIn: "signIn",
        signOut: "signOut",
        getEntireCollection: "getEntireCollection",
        getSingleDocument: "getSingleDocument",
        saveDocument: "saveDocument"
    };
}

How do I go about doing this? I don't really know what the right way of phrasing this is which is hindering my Googling!

shuttleCommands is a function. Drop the function ceremony and make it an object literal. — Daniel A. White
– Daniel A. White, Commented Mar 6, 2015 at 20:29
You have to run shuttleCommands first... shuttleCommands is a function. You have to run it for it to return the object with what you're trying to get. — Sethen
– Sethen, Commented Mar 6, 2015 at 20:31

Michael Lorton · Accepted Answer · 2015-03-06 20:32:01Z

1

myShuttle.command = shuttleCommands.signIn;

This will assign myShuttle.command to the signIn attribute of the shuttleCommands function itself, which is probably undefined.

I think you want to assign myShuttle.command to the signIn attribute of the value returned by the shuttleCommands function, which would be

myShuttle.command = shuttleCommands().signIn;

answered Mar 6, 2015 at 20:32

Michael Lorton

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5 Comments

Sethen Over a year ago

Yup, this is what should happen.

DWJB Over a year ago

At first look I thought that was the ticket but I'm getting a TypeError: object is not a function error. It was a global variable before but I want to wrap it in a function to stop it being global.

Michael Lorton Over a year ago

If shuttleCommands isn't a function, what is it? You might want to learn to use the browser's debugger.

DWJB Over a year ago

It's exactly as I've put it above, which is a function as far as I can tell.

Michael Lorton Over a year ago

Your computer has a different opinion, and it is usually well-informed about such things. Investigate with the debugger.

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