What are the common errors when using var, let, and const in JavaScript?
An example of an AI chatbot conversation about common errors with var, let, and const in JavaScript.
What are the common errors when using var, let, and const in JavaScript?
Common errors include hoisting issues with 'var', scope confusion with 'let', and reassignment mistakes with 'const'.
Can you explain hoisting and how it affects 'var'?
Sure! 'Var' declarations are hoisted to the top of their scope, meaning they can be used before they're declared.
What about 'let' and 'const'? Are they hoisted too?
Yes, both 'let' and 'const' are hoisted, but they cannot be accessed until they are declared, leading to a 'temporal dead zone'.
What happens if I try to reassign a 'const' variable?
Attempting to reassign a 'const' variable will result in a TypeError, as 'const' variables cannot be reassigned.
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