-The shift() method is similar as the pop() method but the difference is that Shift method works at the beginning of the array -The shift() method take the first element off of the given array and returns it The array on which is called is then altered For example var myarray = ["apple ", "banana ", "mango "]; consolelog(myarrayshift()); consolelog(myarray); we get the following console output: apple ["banana ", "mango "]; When we call shift() on an empty array, it will return an undefined value
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1. What are Math Constants and Functions using JavaScript?
Correct Answer: Math object has two constant : MathPI and MathE Math object has following functions: - Mathabs(val1); It will give absolute value of val1 - Mathmax(val1,val2); This fuction will return maximum value from val1 and val2 - Mathrandom(); This function will return a random number between 0 and 1 - Mathfloor(val1) This function will returns decimal value of val1
Correct Answer: Arrays are created by using new Array() in Java Script For example : var employees = new Array(); The elements to this array is assigned as follows : employees[0] = "Kumar" employees[1] = "Fedrick"
Correct Answer: Files can be read and written by using java script functions ? fopen(),fread() and fwrite() The function fopen() takes two parameters ? 1 Path and 2 Mode (0 for reading and 3 for writing) The fopen() function returns -1, if the file is successfully opened Ex: file=fopen(getScriptPath(),0); The function fread() is used for reading the file content Ex: str = fread(file,flength(file)); The function fwrite() is used to write the contents to the file Ex(): file = fopen("c:\MyFiletxt", 3);// opens the file for writing fwrite(file, str);// str is the content that is to be written into the file
Correct Answer: NaN stands for ?not-a-number? The function isNaN determines the argument or the value is a NaN The function returns true if the argument is not a number, otherwise returns false
5. What are windows object and navigator object in JavaScript?
Correct Answer: Windows object is top level object in Java script It contains several other objects such as, document, history, location, name, menu bar etc, in itself Window object is the global object for Java script that is written at client-side Information pertaining to the client browser and system is returned by the navigator object of JavaScript Navigator object is the top level object for all users
Correct Answer: This is a scripting language developed by Microsoft and is based loosely on Visual Basic Its functionality in a web environment is dependant upon either an ASP engine or the Windows Scripting Host, and must be used on a Windows hosting platform
7. .What are the different types of environments available in the web?
Correct Answer: Web application provides services (Free and Paid) apart from information Ex: Online Banking System It provides Bank information , Branches & ATM information, Loans information etc And It provides balance enquiry, Fund transfer, Bill payments like services