Type Error vs Reference Error

What is Type Error?

A Type error is caused when :

1. an operand or argument passed to a function is incompatible with the type expected

2. modified a value that cannot be changed.

3. trying to use the value that can't be used.

There is a variable named const if we try to change the value for it it will throw a type error.

const a = 20;
a = 10;

In the above example, trying to change the value of the const variable throws a type error.

What is Reference Error?

A Reference error is caused when :

1. a variable that doesn't exist in the current scope is referenced.

When you create a variable, all you are doing is creating a reference with a value. var a = 20 tells the JS compiler that any time it sees the variable a, it is seeing a number with a value of 20.

console.log(a);
let a = 20;

In the above example, we are trying to access the variable a before declaring it, so the javascript engine is not able to get a reference for that hence it throws a reference error.

Thank you for reading! Hope you liked it and learned something from it.