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

The 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.

More FAQs in What Is Hoisting in JavaScript?

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

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Memory is allocated during the creation phase before code execution.

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Yes. Function declarations are fully available before execution.

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