Variables defined with let are also hoisted to the top of the block, but not initialized. Meaning: Using a let variable before it is declared will result in a ReferenceError:

Mar 19, 2025 · The let declaration declares re-assignable, block-scoped local variables, optionally initializing each to a value.

Apr 18, 2009 · Variables declared by var keyword are scoped to the immediate function body (hence the function scope) while let variables are scoped to the immediate enclosing block denoted by { } (hence the block scope). var foo = "Foo"; let bar = "Bar"; console.log(foo, bar); // Foo Bar. var moo = "Mooo" let baz = "Bazz"; console.log(moo, baz); // Mooo Bazz.

Nov 7, 2023 · Through this article, you will learn how to declare and mutate variables using var, let, and const, and you'll get a better understanding of the differences between them. I will explain each concept in two parts: Let's dive into these different ways of declaring variables in JavaScript so you know how they work and when to use each one.

Feb 10, 2025 · The let keyword is a modern way to declare variables in JavaScript and was introduced in ECMAScript 6 (ES6). Unlike var, let provides block-level scoping. This behaviour helps developers avoid unintended issues caused by variable hoisting and scope leakage that are common with var. Syntax.

Description The let statement declares a variable. Variables are containers for storing information. Creating a variable in JavaScript is called "declaring" a variable:

This tutorial introduces you to a new way to declare block-scoped variables using JavaScript let and explains the temporal death zone (TDZ) concept clearly.

The let keyword in JavaScript is used to declare variables that can be reassigned later. Introduced in ES6 (ECMAScript 2015), let is block-scoped, which means it is confined to the block (usually denoted by {}) in which it is declared.

Feb 5, 2025 · A detailed guide to the JavaScript 'let' keyword, covering its syntax, scope, and practical usage for variable declarations in modern JavaScript.