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Let In Javascript

In this article, we will discuss "let" in JavaScript.

Purpose

"Let" is used to declare the variable (like "var"). But there are some differences between "let" and "var" in JavaScript.

Consider the following code

<script>
   alert("Hi");
   let x = 12;
   let x = "Karan";

   alert(x);

   var y = 12;
   var y = "Karan";

   alert(y);

</script>

Try It

The above code will not run as we have redeclared the same variable using the "let".

The variable declared inside the curly braces ({}) cannot be accessed outside the block in case of let.

Consider the following example

<script>
    {
        let x = 2;
        var y = 4;
    }

    alert(x);
    alert(y);

</script>

Try It

Here, variable "x" cannot be accessed outside the block but variable "y" can be accessed.

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