Gainsight Front end Developer Interview Questions, Process, and Tips

Round duration - 45 minutes
Round difficulty - Medium

Technical round with questions on Javascript mainly.

Q1. What happens when you call a function using the new keyword?
Ans. 
Calling a function using the new keyword creates a new instance of the function's constructor.
• Creates a new empty object

• Binds 'this' to the new object

• Adds a property to the new object called '__proto__' which points to the constructor function's prototype object

• Returns the new object
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Q2. How can you import all exports of a file as an object in JavaScript?
Ans. 
You can import all exports of a file as an object in JavaScript using the 'import * as' syntax.
• Use the 'import * as' syntax followed by the object name and 'from' keyword to import all exports of a file as an object.

• For example: import * as myExports from './myFile.js';

• You can then access the exports using dot notation, like myExports.myFunction().
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Q3. What is the purpose of the 'this' operator in JavaScript?
Ans. 
The 'this' operator in JavaScript refers to the current context or object.
• Refers to the current object or context in which a function is being executed

• Can be used to access properties and methods of the current object

• The value of 'this' is determined by how a function is called
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Q4. What are arrow functions in JavaScript?
Ans. 
Arrow functions are a concise way to write functions in JavaScript.
• Arrow functions are defined using the '=>' syntax.

• They have a shorter syntax compared to traditional function expressions.

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

• Example: const add = (a, b) => a + b;
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Round duration - 45 minutes
Round difficulty - Easy

Technical round with questions on Angular mainly.

Q1. What is AOT compilation in Angular?
Ans. 
AOT compilation in Angular stands for Ahead-of-Time compilation, which compiles Angular templates and components during the build process.
• AOT compilation improves the performance of Angular applications by pre-compiling the templates and components before the browser downloads and runs them.

• It detects template errors during the build process rather than at runtime, leading to faster rendering and reduced bundle size.

• AO...read more
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Q2. How are observables different from promises?
Ans. 
Observables are streams that can emit multiple values over time, while promises can only emit a single value.
• Observables can emit multiple values over time, while promises can only emit a single value.

• Observables are cancellable, while promises are not.

• Observables support operators like map, filter, and reduce for transforming data streams, while promises do not.

• Observables are lazy, meaning they do not run until they ...read more
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