Salesforce JavaScript Developer Practice Exam

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

1. "number"

2. "string"

3. "object"

4. "undefined"

The correct answer is: "string"

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.