Generally, the value of the counter variable incremented at the end of the body of the "while" loop, whereas the statements are executed first. 7) The "function" and " var" are known as: Explanation: The "function" and "var" both are the Declaration statements. 50) In a case, where the value of the operator is NULL , the typeof returned by the unary operator is___. 28) What will be the output of the following JavaScript code? Here, the alert method concatenates both given strings and prints as a single string in the form of output. 30) See the given code of JavaScript and choose the correct output from the following: Explanation: In JavaScript, the alert method does the typecasting and converts the value of the variable "valueinit" to a string after that it concatenates both of the strings and displayed them on the screen. Javascript helps you create really beautiful and crazy fast websites. The user friendly JavaScript online compiler that allows you to write JavaScript code and run it online. We can convert a text to string without using "new" operator that are: human.tostring() and the another one is String(human). All browser compatibility updates at a glance, Frequently asked questions about MDN Plus. Explanation: The object creation expression creates a new object and also invokes a method called constructor in order to initialize the properties of that object. 106) Which one of the following options is the correct output for the given code of JavaScript? is a well known explanation for variables, properties of objects, and elements of arrays. Browse the complete JavaScript reference documentation. Explanation: The "array.join()" method is one of the predefined methods of the JavaScript. Explanation: In JavaScript, the local variable takes precedence over the global variable if the name of both local and global variables is the same. It uses the node.js compiler to compile code. Therefore, it is saying something that is not true, makes it true. Code. We recommend reading this tutorial, in the sequence listed in the left menu. If the comparison performed in the "if" statement evaluates to true, then the instruction written in the if statement will be executed. Mail us on h[emailprotected], to get more information about given services. It can place elements in ascending order, in descending order or random order. Here we learn JavaScript, starting from scratch and go on to advanced concepts like OOP. For example the "date.toLocaleSting is also one of the predefined functions of the javascript that is used for converting time and date into a string. The "Reverse()" method, which is used along with it, reverses the specified array, and it stores the array into the memory once it gets reversed. 124) What output will be returned by the function in the following code? 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This is a good project to get you started working with the DOM. than text explanations. 87) Which one of the following options is the correct output for the given code of javascript? Use //# instead, TypeError: can't assign to property "x" on "y": not an object, TypeError: can't convert BigInt to number, TypeError: can't define property "x": "obj" is not extensible, TypeError: can't delete non-configurable array element, TypeError: can't redefine non-configurable property "x", TypeError: cannot use 'in' operator to search for 'x' in 'y', TypeError: invalid 'instanceof' operand 'x', TypeError: invalid Array.prototype.sort argument, TypeError: invalid assignment to const "x", TypeError: property "x" is non-configurable and can't be deleted, TypeError: Reduce of empty array with no initial value, TypeError: setting getter-only property "x", TypeError: X.prototype.y called on incompatible type, Warning: -file- is being assigned a //# sourceMappingURL, but already has one, Warning: unreachable code after return statement, ECMAScript Internationalization API specification, Understanding client-side JavaScript frameworks. 86) Which one of the following options is the correct output for the given code of JavaScript? Explanation: The Objects in the JavaScript are considered as a set of unordered related data(or properties), reference types, in the form of "key: value" pairs. A much more detailed guide to the JavaScript language, aimed at those with previous programming experience either in JavaScript or another language. Compile Java File: Simple - Javatpoint public class Simple { public static void main (String args []) { System.out.println ("hello javatpoint"); }} Most of the time, this happens between the stages 3 and 4, and is usually before the spec is officially published. It is calling itself inside the function. Explanation: The "apply()" used in the above given code is a pre-defined method in which an array is passed as an argument and another argument passed a NULL. work towards your goal. Let's see the example of function that has one argument. This tutorial supplements all explanations with clarifying "Try it Yourself" examples. JavaScript is an object-based client-side scripting language that is popular and used to create dynamic and interactive web pages. 114) Which of the following values will be returned by the last statement in the given code? Visit Mozilla Corporations not-for-profit parent, the Mozilla Foundation.Portions of this content are 19982023 by individual mozilla.org contributors. The traditional website uses js to provide several forms of interactivity and simplicity. Examples are often easier to understand @media(min-width:0px){#div-gpt-ad-w3schools_in-box-2-0-asloaded{max-width:300px!important;max-height:250px!important}}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'w3schools_in-box-2','ezslot_1',131,'0','0'])};__ez_fad_position('div-gpt-ad-w3schools_in-box-2-0'); The above example prints the "Hello Test!" It skips the upcoming statements in that iteration form where it gets encountered, and instead of exiting the loop, it moves to the next iteration. In this tutorial, you will learn how to create a tours page where the user can delete which tours they are not interested in. Enjoy our free tutorials like millions of other internet users since 1999, Explore our selection of references covering all popular coding languages, Create your own website with W3Schools Spaces - no setup required, Test your skills with different exercises, Test yourself with multiple choice questions, Create a free W3Schools Account to Improve Your Learning Experience, Track your learning progress at W3Schools and collect rewards, Become a PRO user and unlock powerful features (ad-free, hosting, videos,..), Not sure where you want to start? After concatenation, both the strings are shown as a concatenated string. When JavaScript was discovered, it was initially called Mocha, then renamed to LiveScript, and finally to JavaScript when Netscape and Sun did a license agreement. He realized that the web needed to become more dynamic. This is a common feature found in a lot of websites. In order to know about an object, whether the object is a prototype (or a part of a prototype chain) of another object, the user can use the "isPrototypeOf()" method. Duration: 1 week to 2 week. In this tutorial, you will learn how to create tabs for a mock portfolio page. In this tutorial, Thomas Weibenfalk will teach you how to build the classic Arkanoid game in TypeScript. This module gives you some fundamental background knowledge about how client-side frameworks work and how they fit into your toolset, before moving on to a series of tutorials covering some of today's most popular ones. Visit https://www . Create a variable called carName and assign the value Volvo to it. 39) Which of the following is the correct output for the following JavaScript code: Explanation: In the following JavaScript code, the "?" Whatever web page development code you want to do with JavaScript, it interacts with objects created using HTML. Answer: C: "alert("Hello World");" is the correct answer. 121) In the following code, what value should the variable "a" contain? The JavaScript language. Both x and y are equal in value, type and reference address as well. It is not OOP's based language, because it doesn't have three basic properties of object-oriented programming languages, such as polymorphism, encapsulation, and inheritance. In this tutorial, you will learn how to create tabs that will display different content which is useful when creating single page applications. 120) If the following lines of code differ, what is the difference? Description The & operator is overloaded for two types of operands: number and BigInt. Explanation: In the "For" loop statement, the Initialization, Testing, and Updating(and in the same order) are the most significant manipulations. Learn how do-while, for-in, for-of, try-catch, let, var, const, if-else, switch, and more JavaScript statements and keywords work. 135) Which HTML element is used to put the JavaScript code? 19) When there is an indefinite or an infinite value during an arithmetic computation in a program, then JavaScript prints______. 108) Which one of the following options is the correct output for the given code of JavaScript? is continuously updated according to the latest web standards. You can have many classes in one java source file. So, here the correct output would be 4050. Explanation: The term "lvalue" is one of the historical terms which states that "an Expression that can appear legally on the left-side of the Assignment Expression". 33) Consider the following snippet of JavaScript code: Which one of the following statement is most suitable to check if the pattern matches with the sting "text". Answer: D: "