What is the result of the following JavaScript execution context behavior?

Question

Web Development — Hard

What is the result of the following JavaScript execution context behavior?

Accepted Answer

Variables declared with 'var' are hoisted to the top of their function or global scope and initialized with 'undefined'. Therefore, accessing 'a' before the assignment line results in 'undefined'. 'let' and 'const' are also hoisted but remain in the 'temporal dead zone' until the declaration is evaluated, causing a ReferenceError if accessed early.