What is the difference between var, let, and const?
An example of an AI chatbot conversation about variable declarations in JavaScript.
Can you explain the difference between var, let, and const in JavaScript?
Sure! In JavaScript, 'var' is function-scoped, while 'let' and 'const' are block-scoped. 'const' is used for constants.
What does function-scoped and block-scoped mean?
Function-scoped means the variable is accessible within the function it was declared. Block-scoped means it's only accessible within the nearest enclosing block, like a loop or an if statement.
Can I reassign a variable declared with const?
No, you cannot reassign a variable declared with 'const'. It must be initialized at the time of declaration and cannot be changed later.
When should I use var instead of let or const?
It's generally recommended to avoid 'var' in modern JavaScript. Use 'let' for variables that will change and 'const' for constants.
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