javascript function default return value
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in javascript, functions can have a default return value if no explicit return statement is provided. when a function is called without a return statement, it automatically returns `undefined`.
here is an example to demonstrate this concept:
in the example above, the `greet` function takes a `name` parameter and logs a greeting message to the console. however, the function does not have a return statement. when we call the function with the argument 'alice', it logs the message as expected but the return value stored in the `result` variable is `undefined`.
if you want a function to return a specific value by default when no return statement is provided, you can explicitly return that value at the end of the function. here is an example:
in the `multiply` function above, we check if both `a` and `b` are numbers. if not, we log a message and explicitly return `undefined`. otherwise, we return the product of `a` and `b`.
remember, it's always good practice to include explicit return statements in your functions to make the code more readable and predictable.
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