In your examples you could rewrite it as follows: function test() { console.log(this); } and call it as follows: test.apply(this);
Please mail your requirement at hr@javatpoint.com. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. apply takes two arguments: test.apply(null, [body]); The first argument sets the value of this when the function is executed. JavaScript Function apply() method. apply() Parameters. The value of “this” can be specified at the time of the calling of a function.The call() and apply() method work in the same manner. Standard: ECMAScript (ECMA-262) The definition of 'Function.prototype.apply' in that specification. That means a single function can be used by more than one object by specifying the different values i.e object reference as the first parameter of the apply method. The call() method accepts the arguments in the comma-separated format while the apply() method expects the argument list to be specified in the array format as the second argument of the function call.We can see that after using apply for your function it results in the calling of the function with the specified argument to be referenced by the “this” keyword and the arguments are passed to the function as specified in the array in the second parameter. Developed by JavaTpoint. What you need to do is simply mention the value or object to be referenced by the “this” keyword as the first parameter to the apply() method.This is a guide to JavaScript Apply. Javascript apply is the method that helps us to call a function that sets the passed value or the object that is specified as the “this” keyword which is referred to as the current referencing object whenever the apply method is called and the array of the arguments that you want to pass to that function as the second parameter.
Syntax Viewed 57k times 36. Applying a function to each object in a JavaScript array. Uses the new array object as the argument.Since the fifth edition of the ECMAScript, the array-like objects can also be used to specify the arguments. Active 1 year, 3 months ago. A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Syntax. Here we also discuss the introduction and working on apply() method in javascript along with an example and its code implementation. Similarly, if we would have usedinstead of company1 we would have got the following output because now the “this” will refer to the company2 object.We can use the apply method whose full name is Function.prototype.apply() for creating the functions that can be used by multiple objects by simply inheriting them in other objects. Die Methode apply ruft eine Funktion mit einem gegebenen this-Wert und einer beliebigen Anzahl Argumenten auf. Such as for example, function.apply(this, [‘javascript’, ‘mysql’]) uses the array literal while ffunctionunc.apply(this, new Array(‘javascript’, ‘mysql’)). There is no need to rewrite the same function for multiple objects. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Living Standard Javascript apply and call methods might seem to be similar in working. Mail us on hr@javatpoint.com, to get more information about given services. © Copyright 2011-2018 www.javatpoint.com. ALL RIGHTS RESERVED.
The only difference between both of them is that the call() method accepts the list of arguments in the comma-separated fashion while the apply() method wants an argument array. Function names can contain letters, digits, underscores, and dollar signs (same rules as variables). The complete list of browsers and their supporting versions is given at the end of the article.Consider a simple example to get a hold on the sayings mentioned above.We can observe that the company1 records are fetched and the “this” keyword references to the company1 object because we have mentioned it as the first parameter. The apply() method of a Function takes in:. Standard: ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Function.prototype.apply' in that specification. It returns the result of the calling function along provided this value and arguments.Let's see an example to determine the maximum element.Let's see an example to determine the minimum element.Let's see an example to join array of different type.JavaTpoint offers too many high quality services. Function.prototype.apply(thisArg, argArray) Attribute Writable : true Enumerable : false Configurable : true Beschreibung . The definition of 'Function.prototype.apply' in that specification. Unlike call() method, it contains the single array of arguments. you may also have a look at the following articles to learn more –JavaScript Training Program (39 Courses, 23 Projects)© 2020 - EDUCBA. Function Definitions Function Parameters Function Invocation Function Call Function Apply Function Closures JS HTML DOM DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists JS Browser BOM JS Window JS Screen JS Location JS History JS Navigator JS Popup … We can use the array literal or array object to specify the parameters to the function. All rights reserved. thisArg - The value of this provided for the call to func.If function is in non-strict mode, null or undefined values will be replaced by the global object and primitive values will be boxed. Javascript apply is the method that helps us to call a function that sets the passed value or the object that is specified as the “this” keyword which is referred to as the current referencing object whenever the apply method is called and the array of the arguments that you want to pass to that function as the second parameter. The syntax of the apply function is as defined below –The apply() method helps us to write the function once and make the use that function by inheriting it by multiple objects.
call (this, 1, 2)); Assuming that you're not using strict mode, these invocations of add are exactly equivalent. By array-like object, we mean that any object that can have the length property to it such as NodeList or any of the custom object like the JSON format such as { ‘length’: 2, ‘0’: ‘javascript’, ‘1’: ‘MySQL’ } are also supported. However, there is one difference between the two.