Null in Javascript
Null is an interesting term in JavaScript and has many use cases. let's take a deep dive into them,
Define a null variable: null in JavaScript represents an intentional absence of any object value and can be used as a value and also inferred as a type.
Nullable Types: A variable can have a specific type and a null value, we can use both using union types which allows us to use multiple types for a single variable.
Non-Nullable Assertion Operator ( ! ): It helps you deal with situations where a variable might not have a value (null), making sure you don't run into problems when you try to use it.
Strict null checking: strictNullChecks is a TypeScript compiler option that enhances code safety by enforcing stricter rules around handling null and undefined.
Object Prototype: In JavaScript, null is a primitive value, not an object, despite the confusing result of typeof null being 'object'.Null itself does not have a prototype chain when you use Object.getPrototypeOf(null), it attempts to treat null as an object and that is where it will return you an error.
Null vs Undefined
When should a function return null or undefined?
The simple answer is that when there is no error-like situation and there is no value to refer to, return null. Undefined signifies an unintended absence of a value and we usually return undefined when the return value isn't explicitly set. Also, it varies from project to project, what standards they are following.
