function first(param) {
  alert(param + " method to define a function");
}

Pass "first" to this function and you'll get an alert box. The second method of defining a function is the anonymous way. You define a function inline, without giving it a name:

second = function(param) {alert(param + " method to define a function")};

Pass "second" to this function and and you'll get an alert box. The third way to define a function is by constructing it with the Function function. The Function function accepts two parameters: the parameter to be passed, and the body of the function:

third = new Function("param", "alert(param + ' method to define a function')");

Pass "third" to this function and you'll get an alert box.

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