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Can a function return a reference?
Functions can be declared to return a reference type. There are two reasons to make such a declaration: The information being returned is a large enough object that returning a reference is more efficient than returning a copy.
Why would a function return a function?
A return is a value that a function returns to the calling script or function when it completes its task. Adding a description for the return, helps you and anyone else using your function to determine exactly what the value should be used for within the calling script or function.
What happens when a function does not return a value?
If the function b () itself does not return a value, the call returns undefined after whatever other work is done by b (). return b (); calls the function b (), and returns its result. return b; returns a reference to the function b, which you can store in a variable to call later.
How does the replace function return a value?
The replace () function is invoked on the myText string, and is passed two parameters: the substring to find (‘cold’). the string to replace it with (‘warm’). When the function completes (finishes running), it returns a value, which is a new string with the replacement made.
Which is the return value of the MDN function?
When the function completes (finishes running), it returns a value, which is a new string with the replacement made. In the code above, the result of this return value is saved in the variable newString. If you look at the replace () function MDN reference page, you’ll see a section called return value.
How to return value of function in JavaScript?
Calling the function with () in a return statement executes the function, and returns whatever value was returned by the function. It is similar to calling var x = b();, but instead of assigning the return value of b() you are returning it from the calling function a().