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JavaScript developers are in great demand all over the world. It is the one of the most important languages for frontend as well as for backend development. Every IT company, including Google, hires professional JavaScript developers. Acquiring the role of a JavaScript developer at Google is a dream come true for many. Google hires a lot of developers annually and with the right preparation you can achieve that dream of yours. Here we have a set of JavaScript interview questions that can help you in your preparation.
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Why Join Google?
Google provides environment that serves encourages employees to work long hours. Google offices have nap pods, micro kitchens with free meals, wellness and fitness centers etc. This sort of environment and work culture helps increase productivity and efficiency.
The company values its employees by creating an organizational culture. This helps the employees understand their role and reach their potential.
Google give emphasis to employee wellness. At least 80% of Google employees indicated that the company’s culture is positive and pleasant to work for. The company conducts an annual survey to understand the needs and requirements of its employees.
Google Interview Preparation Tips
1: Which of the following is a JavaScript framework/library?
- Research about the company, its culture and the role and responsibilities of a JavaScript developer in the organization. The company’s website, news articles and social media can help you learn about the company.
- Understand what they’re looking for and what they value.
- Practice answering questions by standing in front of a mirror. Observe your expressions and body language and work on it.
- Prepare answers to a few questions like ‘How would you describe yourself?’, ‘What are your talents?’, ‘What are your strength and weaknesses?’, ‘What would be your priorities in your next role?’, etc.
- Also prepare for Google JavaScript interview questions. We have given a few sample questions below.
- During the interview, listen to the questions carefully and take a moment to gather your thoughts.
- Attempt mock interviews and also go through various interview questions.
- Meditate, take a few deep breathe and get relaxed.
Top Google JavaScript Interview Questions and Answers
Preparation is the key to succeed. Here are some sample Google JavaScript interview questions. This will help you prepare for the interview and also give you an idea about what questions you can expect during the interview.
What are the advantages of using External JavaScript?
Some of the advantages of external JS include are increased performance, code separation, and maintainability.
What are the advantages of JavaScript?
JavaScript is easy to use and reduces load on the server. It offers a variety of interfaces and is very versatile. Third-party add-ons enable developers to incorporate small sections of prefabricated code into their code. This makes it easier and faster for developers to create JavaScript applications.
What is the purpose of ‘This’ in JavaScript?
This refers to the owner object in a method and the global object in a function.‘ Its value of depends on where we use it.
What is ‘null’ in JavaScript?
‘null’ is a special value that represents the intentional absence of any object value. It is used to indicate that a variable has no value.
Describe the usage of a debugger in JavaScript code.
The debugger keyword is used to force stop the execution of the code at a breaking point. At each breakpoint, JavaScript will stop executing, and let you examine JavaScript values. The debugger function is executed if any debugging is needed. After examining values, you can resume the execution of code.
How would you join array items into a string?
The array elements in an array are joined together using the join() method. The join() method concatenates all of the elements in an array, separated by commas or a specified separator string. If the array has only one item, it will be returned without using the separator.
Differentiate between let and const.
Both let and const are used to declare variables. let creates variables that can be reassigned another value multiple times. const creates a variable that cannot be reassigned another value.
What is the difference between call() & apply()?
apply() takes arguments as an array whereas call() takes arguments separately.
In JavaScript, how would you convert the string of any base to an integer?
The function parseInt() helps convert string to an integer in JavaScript.
Syntax: parseInt(string, radix)
This function is especially useful when you want to convert strings with different bases such as binary, octal or hexadecimal.
What is the difference between the operators ‘==‘ & ‘===‘?
== is used to compare the value of the variables.
=== is used to compare the type and value of the variables.
Is JavaScript a case-sensitive language?
Yes, JavaScript is acase sensitive language. The keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters.
What is the difference between Local storage & Session storage?
Data in local storage doesn’t expire whereas data in session storage is cleared when the page session ends.
Name the unique types of Error Name Values in JavaScript.
There are 7 types of JavaScript errors:
SyntaxError: There is an error in the syntax
ReferenceError: An illegal reference has occurred
TypeError: A type error has occurred
EvaluationError: An error has occurred in the eval() function
RangeError,: A number is out of range
URIError: There is an error in encodeURI()
InternalError: An internal error has occured
How would you determine the data type an operand belongs to?
Typeof operator is used to determine the data type of a JavaScript variable.
Explain Strict Mode in JavaScript and its characteristics
Strict mode changes previously accepted “bad syntax” into real errors. In strict mode, you cannot use undeclared variables, among other enforced rules. Using “use strict”; eliminates silent errors, enhances performance, disables unsafe features, and makes code more secure and easier to debug.
What is a ternary operator in JavaScript?
A ternary operator is like an alternative to the if/else statement. It takes three operands: a condition followed by a question mark ( ? ), an expression to execute if the condition is true followed by a colon ( : ), and finally the expression to execute if the condition is false.
What are Anonymous functions in JavaScript?
Anonymous functions, also known as closures, is a function that has no name. It is implemented using the Closure class. printf(“Hello %s\r\n”, $name). Even though they are most useful as the value of callable parameters, they have many other uses too.
What are the scopes of a variable in JavaScript?
The scope of a variable is the region in which it is defined. JavaScript variables have two scopes – global and local.
Global Variables have global scope which means it is visible everywhere in the JavaScript code.
Local Variables will be visible only within a function where it is defined.
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