Does const make objects immutable in JavaScript?
No. const prevents reassignment of the variable, but you can still mutate the object's properties. Use Object.freeze() if you want true immutability.
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More FAQs in var vs let vs const Hoisting in JavaScript
var is hoisted and initialized to undefined. let and const are hoisted (memory allocated) but kept uninitialized in the Temporal Dead Zone. Accessing them before the declaration line throws a ReferenceError.
Yes, memory is allocated for them. But they remain in the Temporal Dead Zone until the declaration line is reached. Accessing them early throws a ReferenceError, unlike var which returns undefined.
The period between the start of a block scope and the line where a let or const variable is declared. During this period, accessing the variable throws a ReferenceError.
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