Conscience Information Technologies Front end Developer Interview Questions and Answers

Q1. Explain arrow function
Ans. 
Arrow functions are a concise way to write functions in JavaScript.
• Arrow functions have a shorter syntax compared to traditional function expressions.

• They do not have their own 'this' keyword, instead they inherit 'this' from the parent scope.

• Arrow functions are best suited for non-method functions and do not work well as object methods.
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Q2. What are primitive data types in javascript
Ans. 
Primitive data types in JavaScript are basic data types that are not objects and do not have methods.
• Primitive data types include string, number, boolean, null, undefined, and symbol.

• Examples: 'hello' (string), 42 (number), true (boolean), null, undefined, Symbol('foo')
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Q3. Questions on previously worked projects
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Q4. Explain equality in JS
Ans. 
Equality in JS refers to how values are compared in JavaScript.
• In JavaScript, there are two types of equality: strict equality (===) and loose equality (==)

• Strict equality (===) checks if the values are of the same type and have the same value

• Loose equality (==) converts the operands to the same type before making the comparison

• Example: 1 === '1' is false (strict equality), 1 == '1' is true (loose equality)
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Q5. OOPS concepts in JS
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OOPS concepts in JavaScript involve encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Ability of a class to inherit properties and methods from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the neces...read more
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Complex program to test knowledge of JS, HTML, CSS, DOM manipulation and 2D animations