Question

I’m still trying to understand javascript scoping. What is the simplest way to return a value from an anonymous callback function? For instance,

var test = 'outside';
callsFunction(function() { test = 'inside'; });
console.log(test);

where callsFunction calls the anonymous function. I would like this to print ‘inside’.

Answer 1

I’m a little bit confused, but I believe this is what you’re after

function callsFunction( fn )
{
  fn();
}

var test = 'outside';
callsFunction(function() { test = 'inside'; });
console.log(test);

Note that any function can be invoked via the usage of (). However, there are special methods for invoking functions from different contexts, such as Function.call() and Function.apply()