Example of unreachable function in JS closure, good to keep in mind for when writing JS code Note browsers need functions in closures to be "explicitly unreachable" in order for garbage collection.

unreachable.js

var someFunc = function() {};

function f() {
    var some = new someFunc(); // this won't be garbage collected!!!
    function unreachable() {}; 
    return function() {};
}

window.f_ = f():

// some references a new someFunc() but there's no way to access some now! It's still there it's just not doing anything.