Platinus Technologies Javascript Developer Interview Questions and Answers

Q1. How do you check if a number s even in JavaScript?
Ans. 
Check if a number is even by using the modulo operator.
• Use the modulo operator (%) to check if the number divided by 2 has a remainder of 0.

• If the remainder is 0, then the number is even.

• Example: if(num % 2 === 0) { // number is even }
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Q2. Use the modulo operator.
Ans. 
The modulo operator returns the remainder of a division operation.
• Use the % symbol to perform the modulo operation.

• Example: 10 % 3 will return 1 (10 divided by 3 is 3 with a remainder of 1).
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Q1. How do you declare a variable in JavaScript?
Ans. 
Variables in JavaScript are declared using the 'var', 'let', or 'const' keywords.
• Use 'var' to declare a variable with function scope.

• Use 'let' to declare a variable with block scope.

• Use 'const' to declare a constant variable.

• Example: var x = 5; let y = 'hello'; const PI = 3.14;
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Q2. In JavaScript using, u can declare a variable using var, let or const
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Duration is around 1 hour

Q1. 1. Basic programming concepts 2. OOP concepts and basic problem solving skills
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Q1. Programming question
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Q1. 1. Basic questions
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Q1. Second largest number in an array
Ans. 
Find the second largest number in an array of strings.
• Convert the strings to numbers for comparison.

• Sort the array in descending order.

• Return the second element in the sorted array.
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Q2. Pairs with given sum
Ans. 
Find pairs in an array that sum up to a given target value.
• Use a hash set to store the difference between the target value and each element in the array.

• Iterate through the array and check if the current element's complement exists in the hash set.

• Return the pairs that sum up to the target value.
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Q1. OOPS based questions
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Q2. Basic language based questions
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Q1. What is single page application
Ans. 
Single page application is a web application that loads a single HTML page and dynamically updates the content as the user interacts with the app.
• SPA uses AJAX and HTML5 to create fluid and responsive user experience.

• It eliminates the need for page reloading during use, making it faster and more efficient.

• Examples include Gmail, Facebook, and Google Maps.
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Q2. What is state management
Ans. 
State management is the process of managing the state of an application, including data flow, user interface updates, and user interactions.
• State management involves storing and updating the state of an application to ensure data consistency.

• It helps in managing user interface updates based on changes in the application state.

• State management is crucial for handling user interactions and maintaining a seamless user exp...read more
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