From syntax and features every JavaScript developer needs ... A closure is the way a variable’s scope acts in special circumstances. When a new function scope is declared, the variables in ...

A closure in JavaScript is an inner function that has access to its outer function’s scope, even after the outer ... ll deal with errors: try/catch blocks, throwing new errors, and on() handlers.

In JavaScript, the function object itself contains a non-accessible ... points to a LexicalEnvironment record of the declaring Execution Context (i.e. a function block’s “parent” scope). Functions ...

It was a Wednesday. I hear a lot of talk about how it’s a performance penalty to use globally scoped variables in JavaScript (not to mention, dangerous / dumb). When a function looks for a variable, ...