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[FREE] Javascript Interview Questions And Answers Github | latest
GIT reset — It is used to reset the index and as well as the working directory to the state of the last commit. GIT checkout — It is used to update the directories of the working tree with those from another branch without merging. GIT...[GET] Javascript Interview Questions And Answers Github | latest!
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- Typescript was developed by Anders Hejlsberg in , who is the lead architect of C and the creator of Delphi and Turbo Pascal. Typescript is a free and open source programming language maintained by Microsoft. It is a superset of JavaScript. It was developed for the development of large application. The current stable version of this programming language is 2. It offers support for the latest and evolving JavaScript features. Installing Typescript with the help of node and npm is recommended. Here, npm is used to install all the libraries and tools. Make sure that you check the version of Typescript installed on your system. Following steps are involved for installing Typescript on your system: Download and run the. Type the following command in the terminal window to install Typescript: npm install —g typescript A variable is a named space in the memory which stores a particular value. While declaring a variable in Typescript, certain rules should be followed like- A variable name should contain alphabets and numeric digits.
- A variable name cannot begin with a digit. You should always keep in mind, that a variable should be declared before being used. A variable can be declared using 4 methods: — Declare its type and value in one statement. Explain them with reference to Typescript. An interface is a syntactical contract which defines the syntax of any entity. Interfaces in Typescript define properties, methods, and events which are the members of the interface. It contains only the declaration of the members. It is responsible for deriving classes to define the members.
- It often helps in providing a standard structure that the deriving classes would follow. They have zero runtime JavaScript impact. Interfaces can define both the kind of keys which an array uses and the type of entry it contains. List some features of classes. We all know that Typescript is a type of object-oriented JavaScript and supports object-oriented programming features like- classes, interfaces, etc. Here, a class in terms of object-oriented programming is a blueprint for creating objects. A class is used to encapsulate data for the object. A built-in support is provided by Typescript for this feature. Classes are created in hierarchies and with the help of inheritance; the features of one class can be used in the other. Polymorphism takes place.
Top 50 CSS Interview Questions You Should Prepare For In 2021
What was the most interesting solution you implemented during your last project? What is the last book you read? How big was your team? Have you ever worked in Agile, Scrum or Kanban environments? Which developers do you know in the Front End community? What do you do to improve programming skills? What are the most common types of web attacks? What is the difference? What do you know about "60fps"? How can you achieve it? Which of these selectors has the highest specificity. What color will be applied to the paragraph?- What does the pseudo-class :root refer to? What preprocessor do you use? What is the best book for learning JavaScript and why? How to check if a value is NaN? What the reason that window. What is hoisting? Which is better? When is the use of recursion useful in Javascript? What is the difference between Deferred and Promise objects? Where is Deferred object used? What is the problem throttling and debouncing are resolved? What is the core difference between them? What do you prefer?
- Make it possible to execute function in this way: 'javascript'. Write a factorial function without side effect. What does each part of code return? What is the difference between 'smart and dummy' components? How to create higher order component? Tell about React in the SEO context. What does mean "Isomorphic React Application"? What advantages or disadvantages of this concept you know? List unit testing best practices principles. Where do you see yourself in 5 years?
- View answer This is an increasingly common practice, employed by many popular JavaScript libraries jQuery, Node. This technique creates a closure around the entire contents of the file which, perhaps most importantly, creates a private namespace and thereby helps avoid potential name clashes between different JavaScript modules and libraries. Another feature of this technique is to allow for an easily referenceable presumably shorter alias for a global variable. This is often used, for example, in jQuery plugins.
- View answer The short and most important answer here is that use strict is a way to voluntarily enforce stricter parsing and error handling on your JavaScript code at runtime. Code errors that would otherwise have been ignored or would have failed silently will now generate errors or throw exceptions. In general, it is a good practice. Some of the key benefits of strict mode include: Makes debugging easier. Code errors that would otherwise have been ignored or would have failed silently will now generate errors or throw exceptions, alerting you sooner to problems in your code and directing you more quickly to their source. Prevents accidental globals. Without strict mode, assigning a value to an undeclared variable automatically creates a global variable with that name.
- This is one of the most common errors in JavaScript. In strict mode, attempting to do so throws an error. Eliminates this coercion. Without strict mode, a reference to a this value of null or undefined is automatically coerced to the global. This can cause many headfakes and pull-out-your-hair kind of bugs. In strict mode, referencing a a this value of null or undefined throws an error. Disallows duplicate parameter values. Strict mode throws an error when it detects a duplicate named argument for a function e. Makes eval safer. There are some differences in the way eval behaves in strict mode and in non-strict mode. Most significantly, in strict mode, variables and functions declared inside of an eval statement are not created in the containing scope they are created in the containing scope in non-strict mode, which can also be a common source of problems.
- Throws error on invalid usage of delete. The delete operator used to remove properties from objects cannot be used on non-configurable properties of the object. Non-strict code will fail silently when an attempt is made to delete a non-configurable property, whereas strict mode will throw an error in such a case. Consider the two functions below. Will they both return the same thing? Why or why not? Rather: console. The reason for this has to do with the fact that semicolons are technically optional in JavaScript although omitting them is generally really bad form. As a result, when the line containing the return statement with nothing else on the line is encountered in foo2 , a semicolon is automatically inserted immediately after the return statement. This behavior also argues for following the convention of placing an opening curly brace at the end of a line in JavaScript, rather than on the beginning of a new line.
- As shown here, this becomes more than just a stylistic preference in JavaScript. What will the code below output? Explain your answer. Numbers in JavaScript are all treated with floating point precision, and as such, may not always yield the expected results. Surprisingly, it will print out: 0. OK, fine. The answer has to do with properly understanding JavaScript events and timing.
- The browser has an event loop which checks the event queue and processes pending events. For example, if an event happens in the background e. When the onclick handler is complete, the queue is checked and the event is then handled e. Similarly, setTimeout also puts execution of its referenced function into the event queue if the browser is busy. Specifically, execution of the function is placed on the event queue to occur on the next timer tick. Note, though, that this is not immediate; the function is not executed until the next tick. Write a simple function less than characters that returns a boolean indicating whether or not a string is a palindrome. The following one line function will return true if str is a palindrome; otherwise, it returns false. This enables us to use the length property to determine at runtime the number of arguments passed to the function.
- If two arguments are passed, we simply add them together and return. Otherwise, we assume it was called in the form sum 2 3 , so we return an anonymous function that adds together the argument passed to sum in this case 2 and the argument passed to the anonymous function in this case 3. If the number of arguments passed exceeds the number of arguments in the function definition, the excess arguments will simply be ignored. On the other hand, if the number of arguments passed is less than the number of arguments in the function definition, the missing arguments will have a value of undefined when referenced within the function. So, in the above example, by simply checking if the 2nd argument is undefined, we can determine which way the function was invoked and proceed accordingly. View answer a No matter what button the user clicks the number 5 will always be logged to the console.
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This is because, at the point that the onclick method is invoked for any of the buttons , the for loop has already completed and the variable i already has a value of 5. Ideally, any lookup performed on a JavaScript object with an unset key evaluates to undefined. This is a useful strategy for ensuring that an object has a given set of properties. Passing this object to Object. What will the code below output to the console and why? The reverse method returns a reference to the array itself i. As a result, arr2 is simply a reference to rather than a copy of arr1. Therefore, when anything is done to arr2 i.- And a couple of side points here that can sometimes trip someone up in answering this question: Passing an array to the push method of another array pushes that entire array as a single element onto the end of the array. As a result, the statement arr2. Like Python, JavaScript honors negative subscripts in calls to array methods like slice as a way of referencing elements at the end of the array; e. But then, we have an operation between a number and a string i. So "1" becomes 1, which then becomes -1 when the - is applied, which is then added to 1 yielding 0, which is then converted to a string and concatenated with the final "2" operand, yielding "02".
- But any operator applied to NaN with any other numeric operand will still yield NaN. The following recursive code will cause a stack overflow if the array list is too large. How can you fix this and still retain the recursive pattern? When nextListItem runs, if item is not null, the timeout function nextListItem is pushed to the event queue and the function exits, thereby leaving the call stack clear. When the event queue runs its timed-out event, the next item is processed and a timer is set to again invoke nextListItem. Accordingly, the method is processed from start to finish without a direct recursive call, so the call stack remains clear, regardless of the number of iterations.
Top 50 JavaScript Interview Questions You Must Prepare In 2021
Provide an example. The or operator. In an expression of the form X Y, X is first evaluated and interpreted as a boolean value. Accordingly, 0 1 evaluates to true 1 , as does 1 2. What will be the output when the following code is executed? The double-equal operator, however, tries to coerce the values before comparing them. The same holds true for! What is the output out of the following code? The reason for this is as follows: When setting an object property, JavaScript will implicitly stringify the parameter value. In this case, since b and c are both objects, they will both be converted to "[object Object]". As a result, a[b] anda[c] are both equivalent to a["[object Object]"] and can be used interchangeably.GitHub - Ajzawawi/js-interview-prep: A Collection Of JS Interview Questions Updated Every Day
Therefore, setting or referencing a[c] is precisely the same as setting or referencing a[b]. What will the following code output to the console: console. The code will output the value of 10 factorial i. What will the console output be and why? Therefore, in this example, since x is not defined in the inner function, the scope of the outer function is searched for a defined variable x, which is found to have a value of 1. The code will output: undefined John Doe The first console. For each element visited, the function should pass that element to a provided callback function.- GIT is a distributed version control system and source code management SCM system with an emphasis to handle small and large projects with speed and efficiency. A repository contains a directory named. The content of the. The —a on the command line instructs git to commit the new content of all tracked files that have been modified. The difference between GIT and SVN is a Git is less preferred for handling extremely large files or frequently changing binary files while SVN can handle multiple projects stored in the same repository. Subversion allows the creation of folders at any location in the repository layout. Multiple developers can checkout, and upload changes and each change can then be attributed to a specific developer.
- GIT stash takes the current state of the working directory and index and puts in on the stack for later and gives you back a clean working directory. It will remove the last added stash item by default, and it can also remove a specific item if you include as an argument. Git branch—merged lists the branches that have been merged into the current branch Git branch—-no merged lists the branches that have not been merged 13 What is the function of git clone?
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The git clone command creates a copy of an existing Git repository. Behaviour of a repository, user info, preferences etc. By running this command. A repository can contain any number of heads. The purpose of branching in GIT is that you can create your own branch and jump between those branches. It will allow you to go to your previous work keeping your recent work intact. This pattern is particularly useful when there are multiple developers working on a single project. Git will not be able to predict which change should take precedence.- Git remembers that you are in the middle of a merger, so it sets the parents of the commit correctly. With the help of GIT version control, you can track the history of a collection of files and includes the functionality to revert the collection of files to another version. Each version captures a snapshot of the file system at a certain point of time. A collection of files and their complete history are stored in a repository.
- Explain how to read and write a file using JavaScript? What are all the looping structures in JavaScript? Following are looping structures in Javascript: For do-while loops What is called Variable typing in Javascript? Variable typing is used to assign a number to a variable and the same variable can be assigned to a string. Example This is called variable typing. How can you convert the string of any base to integer in JavaScript? The parseInt function is used to convert numbers between different bases. In order to convert 4F of base 16 to integer, the code used will be - parseInt "4F", 16 ; Since 3 and 2 are integers, they will be added numerically.
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And since 7 is a string, its concatenation will be done. So the result would be Explain how to detect the operating system on the client machine? In order to detect the operating system on the client machine, the navigator. The NULL value is used to represent no value or no object. It implies no object or null string, no valid boolean value, no number and no array object. What is the function of delete operator? The delete keyword is used to delete the property as well as its value.- What is an undefined value in JavaScript? Undefined value means the Variable used in the code doesn't exist Variable is not assigned to any value Property doesn't exist What are all the types of Pop up boxes available in JavaScript? Alert Prompt What is the use of Void 0? Void 0 is used to prevent the page from refreshing and parameter "zero" is passed while calling. Void 0 is used to call another method without refreshing the page. How can a page be forced to load another page in JavaScript? What is the data type of variables of in JavaScript? All variables in the JavaScript are object data types. What is the difference between an alert box and a confirmation box? An alert box displays only one button which is the OK button. But a Confirmation box displays two buttons namely OK and cancel. What are escape characters?
- Escape characters Backslash is used when working with special characters like single quotes, double quotes, apostrophes and ampersands. Place backslash before the characters to make it display. Example: document. What are JavaScript Cookies? Cookies are the small test files stored in a computer and it gets created when the user visits the websites to store information that they need. Example could be User Name details and shopping cart information from the previous visits. Explain what is pop method in JavaScript? The pop method is similar as the shift method but the difference is that the Shift method works at the start of the array. Also the pop method take the last element off of the given array and returns it.
- The array on which is called is then altered. Whether JavaScript has concept level scope? JavaScript does not have concept level scope. The variable declared inside the function has scope inside the function. What is break and continue statements? Break statement exits from the current loop. Continue statement continues with next statement of the loop. What are the two basic groups of dataypes in JavaScript? They are as — Primitive Reference types. Primitive types are number and Boolean data types. Reference types are more complex types like strings and dates. How generic objects can be created? What is the use of type of operator? Which keywords are used to handle exceptions? Which keyword is used to print the text in the screen? What is the use of blur function? Blur function is used to remove the focus from the specified object. What is variable typing? Variable typing is used to assign a number to a variable and then assign string to the same variable.
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How to find operating system in the client machine using JavaScript? The 'Navigator. What are the different types of errors in JavaScript? There are three types of errors: Load time errors: Errors which come up when loading a web page like improper syntax errors are known as Load time errors and it generates the errors dynamically. Logical Errors: These are the errors that occur due to the bad logic performed on a function which is having different operation. What is the use of Push method in JavaScript? The push method is used to add or append one or more elements to the end of an Array.- Using this method, we can append multiple elements by passing multiple arguments What is unshift method in JavaScript? Unshift method is like push method which works at the beginning of the array. This method is used to prepend one or more elements to the beginning of the array. What is the difference between JavaScript and Jscript? Both are almost similar. JavaScript is developed by Netscape and Jscript was developed by Microsoft. How are object properties assigned? What is the 'Strict' mode in JavaScript and how can it be enabled?
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