Can a JavaScript bound function be inspected somehow?
I need to be able to return a bound function from a function, and when unit testing, I'd like to verify the bound function's target, boundThis, and boundArgs. These properties seem to be internal objects in ECMAScript and aren't accessible in the program.
Is there a way to access them? Maybe someone has developed a module that patches Function.prototype.bind() to meet these requirements?
Unfortunately, no (unless you activate a debugger).
It's advised against testing for bound functions. The same result can be obtained using a closure, keeping the closed-over variables hidden. Ultimately, the focus should be on testing behavior rather than implementation. Verify that calling the returned function triggers the target with the anticipated values.
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