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; The read() method should use prompt to read a new number and add it to value. Normally, it is better to use new Function() than eval() to evaluate code: The function parameters provide a clear interface to the evaluated code and you don’t need the slightly awkward syntax of indirect eval() in order to ensure that the evaluated code can only access its own and global variables. In this tutorial, we will learn several ways to define a function, call a function, and use function parameters in JavaScript. The createPerson() is a factory function because it returns a new person object. In JavaScript, any function can return an object. ; addTwoNumbers is the function’s name, which is customizable — just like variable names. (x, y) are parameters, variable names for the inputs a function will accept. JavaScript functions are a special type of objects, called function objects. Read on for a full explanation. Below is the syntax for a function in JavaScript. The code is literally just a string. function nameOfFunction() { // Code to be executed } There’s a lot going on in the example above, so let’s look at each part individually. In your first statement the constructor function called is an already defined function, Function . When an inherited function is executed, the value of this points to the inheriting object. Note, that when a function is called with the new keyword in javascript it exhibits special behavior. Defining a Function. Before we use a function, we need to define it. Function Definition. Object that it creates should: Store the “current value” in the property value.The starting value is set to the argument of the constructor startingValue. This section explains how to write your own functions in JavaScript. The ways of the declaration described above create the same function object type. (It is possible to attach a new function to a instance in JavaScript). Functions are defined, or declared, with the function keyword. The following code uses the createPerson() factory function to create two objects john and jane: It works like creating a new function, but as functions are objects in JavaScript, you create an object. Let’s see an example: One more thing: new Function. When an object is created using the constructor, it inherits all its properties and methods: Example Copy A factory function is any function which is not a class or constructor that returns a (presumably new) object. In JavaScript functions are first-class objects - a function is a regular object of type function. You can add functions to this prototype property, and in this form, it is known as a method. JavaScript allows us to write our own functions as well. 6. If it does not find there then it uses studObj's __proto__ link which points to the prototype object of Student function. Every JavaScript function has a prototype property, which is empty by default. 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