Pradeep Bhosle

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April 17, 2012

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JavaScript Interview questions and answers part 2

What is function? Function is collection of statements which can be used anywhere in program, it is used to perform specific task. What are type of function? Two type of function Named function : Function which is have name at the time of definition are named function function myFun ( ) { console . log ( 'This is a name function' ) ; } Anonymous Function: Which do not have names are anonymous functions. var myFun = function ( ) { console . log ( 'Anomymouse Function' ) } What is isNaNa? The isNaNa() function is used to determines whether a value is an illegal number (Not a Number) The function returns true if the value equates to NaNa. otherwise it return false. var a = '50' ; var b = 10 ; var c = 20 ; var d = 'Pradeep' ; console . log ( isNaN ( a ) ) // Output: false console . log ( isNaN ( b ) ) // Output: false console . log ( isNaN ( c ) ) // Output: false console . log ( isNaN ...

JavaScript Interview questions and answers part 1

What is an IIFE? or What is an IIFE and Why are they used? Immediately invoked function expression A function that is executed right after it is created. As you know that a function in JavaScript creates the local scope. So, you can define variables and function inside a function which cannot be access outside of that function. However, sometime you accidentally pollute the global variables or functions by unknowingly giving same name to variables & functions as global variable & function names. For example, there are multiple .js files in your application written by multiple developers over a period of time. Single JavaScript file includes many functions and so these multiple .js files will result in large number of functions. There is a good chance of having same name of function exists in different .js files written by multiple developer and if these files included in a single web page then it will pollute the global scope by having two or more function or variables with...

JavaScript Learning For, While and Do while Loop

JavaScript provides repeating code with control is provided in the form of loops.. for for…in forEach while do…while 1. for Loop for loop is used when we want to execute the set of statements for a certain number of times. for ( initialization ; condition ; increment ) { // Code to be executed // eg. for loop for ( var i = 1 ; i <= 5 ; i ++ ) { console . log ( i ) ; } // output: 1 2 3 4 5 } initialization:- It is used to initialize the counter variables, for example, let i=0. Condition:- The condition is evaluated at the beginning of each iteration. If it evaluates to true, the loop statements execute, and If it evaluates to false, the execution of the loop ends, i.e., i < 100. Increment:- it updates the loop counter with an incremented value value each time the loop runs for example i++; 2. for… in Loop used when we want to iterates over the properties of an obj...

JavaScript Learning Fetch API

The Fetch API is a promise-based API of JavaScript for making asynchronous HTTP requests in the browser similar to XMLHttpRequest (XHR). the fetch API is a simple and clean API that uses promises to provides more powerful features to fetch resources from the server. Fetch API is standardized now and is supported by all modern browsers except IE. The fetch() method only has one mandatory argument: the URL of the resource that we want to fetch. fetch ( 'https://jsonplaceholder.typicode.com/users' ) . then ( response => { // handle response data } ) . catch ( err => { // handle errors } ) ; // GET Request:- fetch ( 'https://jsonplaceholder.typicode.com/users' ) . then ( response => response . json ( ) ) . then ( data => { console . log ( data ) // Prints result from `response.json()` in getRequest } ...

JavaScript Learning Strings_Properties Method and Template Literals

Strings are useful for holding data that can be represented in text form. You are use single quotes (' ') or double quotes (" ") to wrap a string literal. In Es6 you create a template literal by wrapping your text in back ticks let simple = ` This is your text ` ; // eg. 01 let firstName = 'Pradeep' , lastName = 'Bhosle' ; let fullName = ` Hi your firstname is ${ firstName } and last name is ${ lastName } ` ; console . log ( fullName ) ; // Output: Hi your firstname is Pradeep and last name is Bhosle JavaScript String Method charAt(2) : Its return the character at the "2" position with in the string. let myName = "Pradeep Bhosle" ; // 0P 1r 2a console . log ( myName . chrAt ( 2 ) ) ; // Output: a concat(a1,a2) : Combines one or more string and return the concatenate string. let a1 = "Pradeep Bhosle" ; let ...

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