Closures
In JavaScript, a closure is a feature that allows a
function to retain access to variables from its outer
(enclosing) scope even after the outer function has
finished executing. This means that the inner
function “closes over” the variables it references,
and they remain accessible even when the outer
function has completed its execution.
Currying:
Currying is a technique in functional programming
where a function with multiple arguments is
transformed into a sequence of functions, each
taking a single argument. This allows you to
partially apply the function and create new
functions with fewer arguments. Currying is often
used to create more specialized and reusable
functions.
Coalesing:
The nullish coalescing (??) operator is a
logical operator that returns its right-hand
side operand when its left-hand side operand
is null or undefined, and otherwise returns its
left-hand side operand. It’s commonly used to
provide default values for variables.
Proxies and Reflection:
Proxies allow you to intercept and customize
operations performed on objects, providing fine-
grained control over their behavior. Reflection
allows you to inspect and manipulate objects at
runtime. We’ll delve into Proxies and Reflection,
showcasing how they can be used for
metaprogramming and creating powerful
abstractions.