Function Expressions In JavaScript, a function expression is a way to define a function as part of an expression, typically by assigning it to a variable. It's an alternative syntax for creating ...

If called on built-in functions, functions created by Function.prototype.bind(), or other non-JavaScript functions, the function returns a "native" function string similar to the following: ...

‘Higher-order functions’ is a fancy term for functions that take other functions as arguments or that return functions. Very powerful!

Moving from object-oriented to functional programming is a paradigm shift for developers, but these key principles explain why it's worth the effort.