Here I am not using an older version of the browser. Q #25) What is the difference between ‘function declaration’ and ‘function expression’? Answer:  Operand data type can be found using the typeof operator. To test the code, the debugger must be enabled for the browser. This method is only applicable to the declaration of a variable and is not applicable for the initialization of a variable. emp={id:102,name:”Rahul Kumar”,salary:50000}. So the code will work in my browser. Also, the Boolean object can be created using the new operator as follows: (ii) Null: This is a data type that is represented by only one value, the ‘null’ itself. But in exec (), we will search a string for a given pattern, if it finds the matching text then it returns the pattern itself or else it returns ‘null’ value. Question: Please explain the various JavaScript data types? Strict mode will restrict you from using the JavaScript keyword as a variable name or function name. JavaScript is cutting-edge technology and remain in high demand. They’re called anonymous functions because they don’t have a name like normal functions. JavaScript Code has better performance. Uncaught Reference Error: second_num is not defined. Answer: Here in the code given above, the value of the ‘first_num’ variable will not be 1000. Refer to these questions and answers to crack an interview in the very first attempt. The Array constructor method has three different syntaxes. Here the variables are used before declaring it. It can dynamically update the contents of the webpage, which is the beauty of this language. Following is the sample code. In JavaScript objects, values are written as name:value pairs as below: The name:values pairs are called properties. Multiple developers also find this method easier to work with simultaneously. Answer: This is an example of the test () and exec () method, Refer Ques No: 5 for more details. This script is understood by the browser at run time. It disallows duplicate property and parameter names. Output is 102030 because after a string all the + will be treated as string concatenation operator (not binary +). Q #6) What are the advantages of JavaScript? Please refer to previous Q #11, as explained there, the interpreter will take all the variables declared except initialization to the top. Answer: Array items can be joined using the join() method. JavaScript is a template-based language. It is important in JavaScript because it’s suitable for user interface code and beneficial for maintaining the performance on the server. If we provide only one argument to the Array constructor, it refers to the length of the new array with, elements not initialized. Microsoft... 3) How to write a hello world example of JavaScript? The function is used to set the text property of the

tag having ‘display_num’ as Id. Variables defined inside the Global scope are accessible from any part of the code. There is an ‘Uncaught Reference Error’ error also. The client side JavaScript is embedded directly by within the HTML pages. JavaScript supports three Primary, two Composite and two Special data types. What Is Function Hoisting? I am ‘Jerry’. For example, test and Test are two different variables. (Please refer Ques No: 7), This error is thrown if used an undeclared variable Please refer Ques No: 19, Thrown due to the error in eval(). In that case, the statement will create an uninitialized array of size of n. Whereas, the <[n]> statement will create an array of size <1> and assign as value to the first element. It can change as the variable appears in different contexts. When an object constructor or any of its methods gets called, ‘this’ refers to an instance of an object. Q #10) What are the distinct types of Error Name Values? A cookie is a piece of data which is sent from a website (that owns the requested web page) and gets stored locally by the browser at the user end. history.go(number): number may be positive for forward, negative for backward. Q #27) What is a Closure and how do you use it? We see that JavaScript encodes the space between the words in the variable as <%20>. BigInt is created by appending n to the end of an integer. i.e. Boolean values can be used for comparing two variables. If debugging is disabled for the browser, the code will not work. A name-value pair containing the actual data, An expiry date after which the cookie is no longer valid, The domain and path of the server it should be sent to. Practice as many questions as possible and be confident. Answer: There are 6 types of values in ‘Error Name’ Property. For Example. Lastly, the constructor without any argument creates an array with its length set to zero with elements not initialized. 50 Web Developer Interview Questions (2019 Edition), Latest PHP Interview Questions to Refer for Quick Preparation, 100+ AngularJS Interview Questions – 2019 Edition, 30 HTML interview questions for frontend web developers, 15 PHP Interview Questions and Answers for Experienced, Internal Scope, i.e., the variables defined between its curly brackets, Outer Function Scope, i.e., the variables of the enclosing function, Global Scope, i.e., variables defined as globals. To make it more clear, let’s look at the following example. Cursor can be set  in JavaScript by using “cursor” property. It is because these variables are strictly bound to the function that defines it (each having different scopes) and is not accessible in other functions. There are three ways in which to form an array in JavaScript. Even though ‘0’ is the timeout period, it doesn’t mean that it will be executed right away. Here, the code snippet after a