Question 1

Why does calling a function expression before assignment throw a TypeError?

Accepted Answer

Because the variable is hoisted with undefined (with var). Calling undefined() throws TypeError: x is not a function. Only function declarations are hoisted with their body.

Question 2

Is hoisting only for var?

Accepted Answer

No. let, const, and function declarations are also hoisted.

Question 3

Why does var return undefined?

Accepted Answer

Memory is allocated during the creation phase before code execution.

Question 4

Are function declarations hoisted?

Accepted Answer

Yes. Function declarations are fully available before execution.

Why does calling a function expression before assignment throw a TypeError?

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