Because the toString() method is a method of the String object, it must be invoked through a particular instance of the String class. Next: The toString() method returns a string, representing the source code of the specified object. '; }, HomeOwner.prototype.toString = function HomeOwnerToString() { The JavaScript Object toString() method returns the object as a string. not one you often call explicitly in your JavaScript programs. alert(owner.toString()); Automatically invoked when an object is called and a string is expected or when viewing the object as a string. function that expects a string argument: Similarly, objects are converted to strings when they are Implemented in JavaScript 1.1. While it is true the alert function will display the return value of the function overriding the prototype toString property, Object.prototype.toString.call(f) will still display [object Object]. string. concatenated to strings with the + operator: The toString( ) method is Example: The following web document demonstrates how the toString() method can be used. returned for your object, you need to override the Object.toString() method. Let’s check out the different ways of converting a value to a string in JavaScript. var owns = this.firstName + ' ' + this.lastName + ' owns a house! this.firstName=firstName; The value of the accumulator is equal to the previously returned value of the callback function. The JavaScript toString() method returns a string representing the calling object. Sync all your devices and never lose your place. This default method returns a string of the On the fourth call, we again don't return from the callback function. toString( ) method from the None. “Window”, “Document”, and so on. a string whenever the object is used in a string context. Returns a string of the specified object. Terms of service • Privacy policy • Editorial independence, Get unlimited access to books, videos, and. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. example, an object is converted to a string when it is passed to a If you want something meaningful Overriding The Object.toString() Method. calls it whenever it needs to convert your object to a If you don't return a value from a function, it returns undefined. Syntax. We then create and display a string of the object which will use our custom toString() method. The code below creates an object and displays it. We don't return from the callback function, we log the accumulator and current value: 1 and 2 get logged. In JavaScript, the syntax for the toString() method is: string.toString(); Parameters or Arguments. form: where class is the class of the Version. alert(anObject.toString() + ' anObject is an Object instance. The accumulator is again undefined, and the current value is 4. undefined and 4 get logged. © 2020, O’Reilly Media, Inc. All trademarks and registered trademarks appearing on oreilly.com are the property of their respective owners. The following web document demonstrates how the toString() method can be used. As you can see when pressing the above button the default for toString() on an objectType of Object returns [object Object].If you want something meaningful returned for your object, you need to override the Object.toString() method.. Instead, you define this method in your objects, and the system JavaScript String toString() Method. O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers. Because a type inherits the default Object.ToString method, you may find its behavior undesirable and want to change it.
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