closures bard¶

closure is a bad name that means nothing and confuses people

a better name is nested function, or enclosed functio

Term	Definition
Closure	A closure is a function that has access to the variables in its LEXICAL scope, even after the function has returned.
Lexical scope	The LEXICAL scope of a variable is the place in the code where the variable is declared.
Example	Consider the following code:

function makeCounter() {
  let counter = 0;

  function increment() {
    counter++;
    return counter;
  }

  return increment;
}

The makeCounter() function declares a variable called counter. The increment() function is declared inside the makeCounter() function, so it has access to the counter variable. Even though the makeCounter() function returns the increment() function, the counter variable is still in scope. This means that the increment() function can still access the counter variable even after the makeCounter() function has returned.

Term	Definition
Benefits	Closures can be used to implement things like callbacks, promises, and event handlers. They can also be used to create reusable code that can be used in different contexts.
Drawbacks	Closures can make code more difficult to understand and debug. They can also make code less performant, as they can create additional scope chains.

I hope this helps! Let me know if you have any other questions.