Convert string to variable object

Question

I need to convert a string called edos.desktop to a variable containing a main function, it needs to be like this:

edos.desktop = {
    main: function() {
        . . .
    },
};

and I need to call the function like this:

var package = "edos.desktop";
. . .
package.main();

but how?

I tried to use the window[package].main(); and this doesn't work!

I tested:

alert(window[package]);

and it shows undefined, and:

alert(window[package].main());

does not show the alert...

please help me!!!

...and I dont want APIs

"edos.desktop" is input? edos.desktop = { main: function() { . . . }, } is expected output? How is package.main() related to input and output? — guest271314
– guest271314, Commented Feb 17, 2019 at 17:44
You want to transform a string to an object containing a function ? what should this function do ? — jo_va
– jo_va, Commented Feb 17, 2019 at 17:46

Nina Scholz · Accepted Answer · 2019-02-17 17:53:15Z

5

If you have control over the string, you cold use eval and take package as string.

var edos = {},
    package = "edos.desktop";

edos.desktop = { main: function() { console.log('main'); } };

eval(package).main();

Or take the window object and reduce the splitted name space.

function getValue(object, path) {
    return path.split('.').reduce((o, k) => (o || {})[k], object);
}
var edos = {},
    package = "edos.desktop";

edos.desktop = { main: function() { console.log('main'); } };

getValue(window, package).main();

edited Feb 17, 2019 at 17:53

answered Feb 17, 2019 at 17:48

Nina Scholz

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Comments

Jeffrey · Accepted Answer · 2019-02-17 17:58:43Z

1

You can use eval(), but depending on situations, there may be subtle bugs and security problems.

In my experience, smart and quick ways are troublemakers. I Suggest that you do something like this:


var package = "edos.desktop";

switch(package){
    case 'edos.desktop':
    console.log("calling edo.desktop.main...");
    edos.desktop.main();
    break;
    case 'Other case':
    ...
}
...
...

answered Feb 17, 2019 at 17:58

Jeffrey

635 bronze badges

3 Comments

Eduardo Procópio Gomez Over a year ago

its like tis, but for every case: "a.b.c", i want to the function search any variable of type and calls a.b.c.main, if error: (console.log("error on package: "+ package))

Eduardo Procópio Gomez Over a year ago

"case package: { package.main() }" understand?

Eduardo Procópio Gomez Over a year ago

i just want compatibility

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