Toby Rogers

Toby Rogers


JavaScript ES6: Var, Let, and Const || ES6 Variable Declarations Explained

Learn the 2 new keywords that ES6 brings for declaring variables: let & const, when and why to use them instead of the old var keyword.

#javascript #es6 #web-development

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JavaScript ES6: Var, Let, and Const || ES6 Variable Declarations Explained
Dexter  Goodwin

Dexter Goodwin


A Simple Explanation Of JavaScript Variables: Const, Let, Var

The variable is a fundamental concept that any developer should know.

In JavaScript, constlet, and var are the statements you can declarate variable.

I’m going to describe each variable type around the declaration, initialization, value access, and assignment. Each of the 3 types (constlet, and var) create variables that behave differently exactly in these 4 steps.

This post isn’t quite beginner friendly, but rather useful to solidify your knowledge of variables and their behavior.

Let’s get started.

1. Variable identifier

First, let’s understand what a variable is.

In simple terms, a variable is a placeholder (or a box) for a value. A value in JavaScript can be either a primitive value or an object.

The variable has a name, which stricter is called identifier. Examples of identifiers are myNumbernamelistitem.

The syntax of an identifier is pretty simple:

An identifier can contain letters, digits 0..9, and special symbols $_. An identifier cannot start with a digit 0..9.

Examples of valid identifiers are myNumbermy_numberlist1$item_nameab$_.

#javascript #variable #const #let #var

Eldora  Bradtke

Eldora Bradtke


JavaScript Variables Explained. Var, Let and Const with examples.

Before the arrival of ES6 or EcmaScript 6 released in 2015, as a Javascript developer, you could only declare variables using the var keyword.
Now things has changed and two new keywords have been introduced to meet the developers needs who felt the old one way solution very tight for the modern web app requirements.
In this article I will try to explain you in the simplest way possible, the differences between var, let and const type variables.
I think the best way to do this is to try to extrapolate the essence of their nature by describing them in few words followed by examples which gives you the confirmation and consolidation of what you learned in the theory.
Like many other programming languages, JavaScript has variables. I talk you through var, let and const, and how they differ from each other with the use of some simple examples.

#javascript #var #let #const #programming

Eldora  Bradtke

Eldora Bradtke


JavaScript Variables: var and let and const

There are three ways to create variables in a JavaScript application: using var, using let, or using const. This will not be a post trying to convince you which one you should use, or arguing about what is best. It’s just good to know about the differences and what it means when you use the different options. But hopefully by the end of all this you’ll be comfortable with the three options and can make a decision for your team that will suit your needs. To get the most out of this post, it is best if you understand variable scope, which we covered in this post previously.

#javascript #var #let #const

Tanya  Shields

Tanya Shields


Declaring A Winner Between JavaScript's var, let And const

When ECMAScript 6 (also known as ECMAScript 2015) was released a collection of new APIs, programming patterns and language changes became a standard. Since ES6 started gaining browser and nodejs support developers are wondering if they should stop using the traditional var to declare variables.
ES6 introduced two new ways to declare variables, let and const.

var - has function level scoping and can change the value reference
let - has block level scoping and can change the value reference
const - has block level scoping but cannot change the value reference
Both provide better block scoping that var. const differs from let because the immediate value cannot be changed once it is declared.
Variables declared using var are function scoped, which has led to confusion to many developers as they start using in JavaScript.

#javascript #var #let #const #programming

JavaScript Var, Let, and Const - 8

To declare a variable in JavaScript either var, let or const is used.
We will distinguish between the three with the following features:

  • Block scope
  • Update and redeclaration
  • Hoisting
  • Undefined

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