All JavaScript programming happens in an environment like a web browser, Node, or Bun.js. Each of these environments has its own set of pre-defined variables like window and console.

Scope in JavaScript refers to context (or portion) of the code which determines the accessibility (visibility) of variables. In JavaScript, we have two types of scope, local , and global.

It doesn't work the way most people expect it should work. What happens is that the child scope gets its own property that hides/shadows the parent property of the same name. This is not something ...

There’s also some memory and performance implications due to re-defining and executing the immediate function every time you run “doSomething”. But, if you understand the implications and you need to ...

30 November, 2011. 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 ...