Explain function declaration in JavaScript. How is the method of function declaration in JavaScript more flexible?

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Because functions are considered as objects in JavaScript, they can be defined using function operators where the definition of the function becomes the variable's value.?For example, the following code creates a hello function() using thefunction declarationformat:?           function hello() {alert("My name is Sean");  }?The same function can be declared as a variable using thefunction operatorin which the definition of the function becomes the variable's "value":?var hello = function () {alert("Welcome to Hanjie!");}?Although it is created in the form of a variable, the function is still called using the expression:hello()?While the end result is the same, the two ways of defining the hello() function differ in how they are stored. Functions defined with a function declaration are created and saved as the browser parses the code prior to the script being run. The fact that the function is already stored in memory is why statements that run the function can be placed prior to the statement that declares the function.?In contrast, function operators are evaluated as they appear in the script after the code has been parsed by the browser. Function operators are thus more flexible than function declarations, allowing a function to be placed anywhere a variable can be placed.