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These chapters are best after you understand basic functions
(calling, parameters, return values, expressions, and arrows).If you are not comfortable with JavaScript functions yet, start here:
A JavaScript callback is a function passed as an argument to another function, which is then executed (or "called back") at a later point in time to complete a specific task.
How this works (especially inside objects). How this is decided by how it is called.
Call a function with a chosen this. Pass a list of arguments.
Call a function with a chosen this. Pass an array of arguments.