What is the difference between null and undefined?
An example of an AI chatbot conversation about null vs undefined in programming.
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 without assigning it, it will be undefined?
Exactly! For example, if you do 'let x;', x will be undefined. But if you set '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 indicate that a variable should have no value, and use 'undefined' when you want to check if a variable has been declared.
Thanks! That makes it clearer.
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