cannot access before initialization javascript

What is "cannot access before initialization javascript" error and how to fix it?

If you are a developer, you may have come across a "cannot access before initialization javascript" error at some point in your career. This error occurs when you try to access a variable or function before it has been initialized.

Example:

console.log(myVar); // ReferenceError: myVar is not defined
var myVar = 5;

In the above example, we are trying to access the variable "myVar" before it has been declared, and hence we get a ReferenceError.

To fix this error, we need to always declare our variables and functions before using them.

Example:

var myVar = 5;
console.log(myVar); // 5

In the above example, we have declared the variable "myVar" before using it, and hence we do not get an error.

Another way to avoid this error is to use the "let" or "const" keywords instead of "var". When using "let" and "const", variables are not hoisted and can only be accessed after they have been declared.

Example:

console.log(myVar); // ReferenceError: myVar is not defined
let myVar = 5;

In the above example, we are trying to access the variable "myVar" before it has been declared, and hence we get a ReferenceError.

To summarize, always declare your variables and functions before using them to avoid the "cannot access before initialization javascript" error. Also, consider using the "let" or "const" keywords instead of "var" to avoid hoisting.