javascript function into variable

Question

Happy Holidays to all. I'm trying to execute a function that I have saved in a variable, as I could do this?

I tried this.

funcVar = 'function (a, b) {c = a + b; alert (c);}';

document.write (funcVar);

but has no functionality, I want to use that function that is in the variable at some point.

Write?! You could eval, but... what's the actual usecase? In other words, why do you think you want to do this? — Dave Newton
– Dave Newton, Commented Dec 25, 2014 at 14:22
eval is your friend, it works for all things, just do eval(funcVar) and you're golden. — adeneo
– adeneo, Commented Dec 25, 2014 at 14:23
eval is not your friend. eval is slow, hard to debug, and causes more problems than it solves. It solves almost no problems that can't be solved better with another technique. — Quentin
– Quentin, Commented Dec 25, 2014 at 14:23
eval is your friend that drinks all your beer and vomits on your couch. With friends like those... — Dave Newton
– Dave Newton, Commented Dec 25, 2014 at 14:24

Quentin · Accepted Answer · 2014-12-25 14:22:59Z

2

You need to:

You should:

Such:

var funcVar;
funcVar = function (a, b) {
    var c = a + b; 
    alert (c);
};
funVar(1,2);

answered Dec 25, 2014 at 14:22

Quentin

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Comments

Jörg W Mittag · Accepted Answer · 2014-12-25 14:24:13Z

0

That's not a function, that's a string. You need to remove the quotes. And you need to execute it, not print it:

var funcVar = function (a, b) {c = a + b; alert (c);};

funcVar(23, 42);

answered Dec 25, 2014 at 14:24

Jörg W Mittag

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metalbox · Accepted Answer · 2014-12-25 14:32:06Z

-1

This works. Thank you all.

var funcVar;
funcVar = 'function stop() {alert ("Test");}';
eval(funcVar);

stop();

answered Dec 25, 2014 at 14:32

metalbox

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If you are happy with all the potential problems of eval you may prefer the new Function(body_string) syntax