Theory - difference Between var let and const keyword in javascript | Code Secret
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JavaScript is a popular programming language that is used extensively for web development. One of the most important concepts in JavaScript is understanding the differences between the var, let, and const keywords. In this video, we'll explore these keywords and discuss how they differ in terms of scope, hoisting, and mutability.
First, we'll explain the var keyword and how it is used to declare variables in JavaScript. We'll discuss its function-level scope and hoisting behavior, as well as its ability to be redeclared and reassigned.
Next, we'll introduce the let keyword and discuss how it differs from var in terms of block-level scope and absence of hoisting. We'll also talk about how let variables can be reassigned but not redeclared.
Finally, we'll cover the const keyword and explain how it is used to declare constants in JavaScript. We'll discuss its block-level scope, lack of hoisting, and immutability, which means that once a const variable is declared, its value cannot be changed.
By the end of this video, you'll have a clear understanding of the differences between var, let, and const keywords in JavaScript and be able to choose the appropriate one for your programming needs. So, whether you're a beginner or an experienced developer, this video is sure to be a valuable resource for your JavaScript journey.
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