What is the difference between null and undefined in JavaScript?
An example of an AI chatbot conversation about the difference between null and undefined in JavaScript.
Can you explain the difference between null and undefined in JavaScript?
Sure! In JavaScript, 'null' is an intentional absence of any object value, while 'undefined' means a variable has been declared but not assigned a value.
So, if I declare a variable but don't assign it, it will be undefined?
Exactly! For example, if you do 'let x;', x will be undefined. But if you do 'let y = null;', y is explicitly set to have no value.
Are there any situations where I should use one over the other?
Yes! Use 'null' when you want to intentionally clear a variable, and use 'undefined' to check if a variable has been declared.
Thanks! That makes it clearer.
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