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.
The variable is a fundamental concept that any developer should know.
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 (
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.
First, let’s understand what a variable is.
The variable has a name, which stricter is called identifier. Examples of identifiers are
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
Examples of valid identifiers are
We will distinguish between the three with the following features:
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A lot of features given by ES6(ES2015). And good things are many developers use features for solving real-life problem-solving. But beginner and many developers forget to use and make complex programs or applications. Today we are going to cover the difference between let, var, and const.
Basically variable is based on scope, use, and hoisting. now let’s take deep dive into understand variables.