Save JavaScript script text string as function variable to call it

Question

I am fetching a JS script from a server, and getting the following string back:

(function(e){function t(t){for(var r,a,o=t[0],c=t[1] .....

I want to save it as a function variable so I can call it (and pass an argument).

I tried wrapping the string with a return (as suggested here) and then use Function() constructor to call it in order get the original function, but it returns undefined.

How can I do this?

It looks like the code is wrapped in an IIFE, which probably means you can only save the return value to a variable, but not the function itself. — evolutionxbox
– evolutionxbox, Commented Dec 17, 2021 at 16:23

Seeta Ram Yadav · Accepted Answer · 2021-12-17 16:40:48Z

0

Did you try eval https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval

eval is a function that evaluates even if it is a function in string

something like this

const yourVariable = eval("function fromServerResponse(){console.log('executed');}")

edited Dec 17, 2021 at 16:40

answered Dec 17, 2021 at 16:27

Seeta Ram Yadav

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1 Comment

amiregelz Over a year ago

Yes, I'm getting Uncaught (in promise) SyntaxError: Illegal return statement exception. Also, I prefer to not use eval if possible.

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