What will be the output when executing: console.log(typeof typeof 1);?

What will be the output when executing: console.log(typeof typeof 1);?

• A. "number"
• B. "string"
• C. "object"
• D. "undefined"

Answer: (B)

When executing the expression `console.log(typeof typeof 1);`, the innermost `typeof` operator evaluates the expression `1`. Since `1` is a number, the first `typeof` returns the string `"number"`. Next, the outer `typeof` operator evaluates the result of the first `typeof` operation, which is the string `"number"`. The `typeof` operator determines the type of its operand, which in this case is the string `"number"`. Since the type of a string is classified as `"string"`, the outer `typeof` returns `"string"`. Therefore, the final output of the entire expression is `"string"`, making it the correct answer. This demonstrates how the `typeof` operator behaves in nested operations and highlights its return values based on the types of the evaluated expressions.

When executing the expression console.log(typeof typeof 1);, the innermost typeof operator evaluates the expression 1. Since 1 is a number, the first typeof returns the string "number".

Next, the outer typeof operator evaluates the result of the first typeof operation, which is the string "number". The typeof operator determines the type of its operand, which in this case is the string "number". Since the type of a string is classified as "string", the outer typeof returns "string".

Therefore, the final output of the entire expression is "string", making it the correct answer. This demonstrates how the typeof operator behaves in nested operations and highlights its return values based on the types of the evaluated expressions.