How do you find out the caller function in JavaScript when use strict is enabled?

javascript use-strict
Jamie Hutber picture Jamie Hutber · Apr 11, 2015 · Viewed 42.3k times · Source

Is it possible to see the callee/caller of a function when use strict is enabled?

Answer

p.s.w.g picture p.s.w.g · Apr 11, 2015

For what it's worth, I agree with the comments above. For whatever problem you're trying to solve, there are usually better solutions.

However, just for illustrative purposes, here's one (very ugly) solution:

'use strict'

function jamie (){
    var callerName;
    try { throw new Error(); }
    catch (e) { 
        var re = /(\w+)@|at (\w+) \(/g, st = e.stack, m;
        re.exec(st), m = re.exec(st);
        callerName = m[1] || m[2];
    }
    console.log(callerName);
};

function jiminyCricket (){
   jamie();
}

jiminyCricket(); // jiminyCricket

I've only tested this in Chrome, Firefox, and IE11, so your mileage may vary.

Related questions

What does "use strict" do in JavaScript, and what is the reasoning behind it?

Recently, I ran some of my JavaScript code through Crockford's JSLint, and it gave the following error: Problem at line 1 character 1: Missing "use strict" statement. Doing some searching, I realized that some people add "use strict"; into their JavaScript code. …

Read More
How is the 'use strict' statement interpreted in Node.js?

I have started to explore the Node.js and wrote many demo web application, to understand the flow of Node.js, Express.js, jade, etc.. But one thing I came across recently, is the statement "use strict" as the first …

Read More
How to remove global "use strict" added by babel

I'm using function form of "use strict" and don't want global form which Babel adds after transpilation. The problem is I'm using some libraries that aren't using "use strict" mode and it might throw error after scripts are concatenated

Read More