Block Scope. Before ES6 (2015), JavaScript variables had only Global Scope and Function Scope. ES6 introduced two important new JavaScript keywords: let and const. These two …

Block Scope. Before ES6 (2015), JavaScript did not have Block Scope. JavaScript had Global Scope and Function Scope. ES6 introduced the two new JavaScript keywords: let and const. …

Scope. Now that you understand how functions work, it is important to learn how variables act inside and outside of functions. Scope refers to where a variable is allowed to be used. A …

Block Scope. A block of code refers to all of the code between curly braces {}. Variables declared inside blocks of code are only accessible by the code between the curly braces, which follows …

The scope is the binding part between the HTML (view) and the JavaScript (controller). The scope is an object with the available properties and methods. The scope is available for both the view …

A closure is a function that has access to the parent scope, after the parent function has closed. Closures has historically been used to: Create private variables; Preserve state between …

Local Scope. A variable created inside a function belongs to the local scope of that function, and can only be used inside that function.

Hoisting is JavaScript's default behavior of moving all declarations to the top of the current scope (to the top of the current script or the current function). The let and const Keywords Variables …

JavaScript Function Syntax. A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Function names can contain letters, digits, …

The CSS @scope rule allows you to select elements in specific DOM subtrees. With this at-rule you can target elements precisely without writing overly-specific selectors. This at-rule also …