What is the difference between undefined and null?
An example of an AI chatbot conversation about the difference between undefined and null in programming.
Can you explain the difference between undefined and null in JavaScript?
Sure! In JavaScript, 'undefined' means a variable has been declared but not assigned a value, while 'null' is an assignment value that represents no value.
So, if I declare a variable without assigning it, it will be undefined?
Exactly! For example, if you do let x;, x is undefined. But if you do let y = null;, y is explicitly set to have no value.
Are there any situations where I should use null instead of undefined?
Yes, you should use null when you want to intentionally indicate that a variable should have no value, while undefined is more of a default state.
Got it! Thanks for clarifying that.
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