JavaScript Why return function in a function?

Question

var favoriteColor = \"blue\";
function colorGenerator(color) {
    return function () { return color; };
}
var getColor = colorGenerator(favoriteColor);

Answer 1

Hopefully this example can help you to understand how to use the return function

The following example illustrates the use of the return statement to return a function.

JavaScript

function doWork() {
    return function calculate(y) { return y + 1; };
}

var func = doWork();
var x = func(5);
document.write(x);

// Output: 6

PS:
return[(][expression][)];

The optional expression argument is the value to be returned from the function.If omitted, the function does not return a value.
You use the return statement to stop execution of a function and return the value of expression.If expression is omitted, or no return statement is executed from within the function, the expression that called the current function is assigned the value undefined.