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

Explanation

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.

Key points

Var hoisting initializes to undefined
Let/Const hoisting results in temporal dead zone
Hoisting moves declarations, not assignments

Ready to go further?

Start full exam Practice more questions