CarMax Senior Software Engineer Interview Experience
Senior Software Engineer
Summary
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The CarMax interview process featured a comprehensive set of questions primarily focused on JavaScript, TypeScript, React, and .NET technologies. The interview included one round that asked a variety of technical questions, including questions on variable declarations, dependency injection, and practical coding tasks. Overall, the difficulty level was medium, with a good blend of theoretical knowledge and practical application expected from candidates.
1
#1Variable Declaration in JavaScript
Easy
javascript
var
let
const
Explain the differences between 'let', 'const', and 'var' in JavaScript and their use cases.
#1
Variable Declaration in JavaScript
Explain the differences between 'let', 'const', and 'var' in JavaScript and their use cases.
javascript
var
let
const
Easy
#2Dependency Injection in .NET
Medium
net
dependency-injection
lifecycle
What is dependency injection in .NET and what are the different lifecycles associated with it?
#2
Dependency Injection in .NET
What is dependency injection in .NET and what are the different lifecycles associated with it?
net
dependency-injection
lifecycle
Medium
#3useState Vs. Normal Variable
Medium
react
usestate
variables
What is the difference between a normal variable and the useState hook in React?
#3
useState Vs. Normal Variable
What is the difference between a normal variable and the useState hook in React?
react
usestate
variables
Medium
#4Handling Routing in .NET
Medium
net
routing
http
How do you handle routing in .NET? Explain the methods to perform GET and POST requests.
#4
Handling Routing in .NET
How do you handle routing in .NET? Explain the methods to perform GET and POST requests.
net
routing
http
Medium
#5HTTP vs HTTPS
Medium
http
https
web-protocols
What is the difference between an HTTP POST request and an HTTPS GET request?
#5
HTTP vs HTTPS
What is the difference between an HTTP POST request and an HTTPS GET request?
http
https
web-protocols
Medium
#6Understanding 400 Error
Easy
http
error-codes
What does a 400 error signify in the context of HTTP request responses?
#6
Understanding 400 Error
What does a 400 error signify in the context of HTTP request responses?
http
error-codes
Easy
#7Promises in JavaScript
Medium
javascript
promises
asynchronous-programming
Why are promises used in JavaScript and what advantages do they offer over traditional callbacks?
#7
Promises in JavaScript
Why are promises used in JavaScript and what advantages do they offer over traditional callbacks?
javascript
promises
asynchronous-programming
Medium
#8Interface vs Abstract Class
Medium
typescript
interfaces
abstract-classes
What is the difference between an interface and an abstract class in TypeScript? Can you inherit multiple interfaces?
#8
Interface vs Abstract Class
What is the difference between an interface and an abstract class in TypeScript? Can you inherit multiple interfaces?
typescript
interfaces
abstract-classes
Medium
#9Record Type in TypeScript
Medium
typescript
record-type
What is the 'Record' type in TypeScript and how is it used?
#9
Record Type in TypeScript
What is the 'Record' type in TypeScript and how is it used?
typescript
record-type
Medium
#10Benefits of TypeScript
Medium
typescript
javascript
programming-languages
What are the advantages of using TypeScript over JavaScript?
#10
Benefits of TypeScript
What are the advantages of using TypeScript over JavaScript?
typescript
javascript
programming-languages
Medium
#11Controlled vs Uncontrolled Components in React
Medium
react
controlled-components
uncontrolled-components
What are controlled and uncontrolled components in React? How do they differ?
#11
Controlled vs Uncontrolled Components in React
What are controlled and uncontrolled components in React? How do they differ?
react
controlled-components
uncontrolled-components
Medium
#12useLayoutEffect vs useEffect in React
Medium
react
uselayouteffect
useeffect
When does useLayoutEffect run compared to useEffect in React? What are the differences between the two?
#12
useLayoutEffect vs useEffect in React
When does useLayoutEffect run compared to useEffect in React? What are the differences between the two?
react
uselayouteffect
useeffect
Medium
#13Redux Thunk
Medium
redux
redux-thunk
state-management
What is 'Redux Thunk'? How does it facilitate asynchronous actions in Redux?
#13
Redux Thunk
What is 'Redux Thunk'? How does it facilitate asynchronous actions in Redux?
redux
redux-thunk
state-management
Medium
#14Understanding 'Slice' in JavaScript
Easy
javascript
array-methods
What is the 'slice' method in JavaScript? Provide examples of its usage.
#14
Understanding 'Slice' in JavaScript
What is the 'slice' method in JavaScript? Provide examples of its usage.
javascript
array-methods
Easy
#15Average MPG Function Implementation
Medium
javascript
functions
average
Write a function that takes a collection of Cars with properties (Make, Model, MPG) and returns the average MPG for a specified Make.
Input example:
Make Model MPG
Honda Accord 25.0
Honda Civic 28.0
Nissan Altima 24.5
Honda CRV 22.7
Toyota Tundra 19.1
Output example:
Average MPG for Honda: [averageValue]
javascript
function gettingAverage(list, whatMake) {
count = 0;
sum = 0;
list.forEach(e => {
if (whatMake.toUpper() === e.make.toUpper()) {
sum += e.miles;
count += 1;
}
});
if (count == 0) return 0;
return sum / count;
}
const list = [{miles: 12, make: "toy", Model: ""}, {miles: 13, make: "toy"}, {miles: 14, make: "other"}];
const whatMake = "toy";
console.log(gettingAverage(list, whatMake));#15
Average MPG Function Implementation
Write a function that takes a collection of Cars with properties (Make, Model, MPG) and returns the average MPG for a specified Make.
Input example:
Make Model MPG
Honda Accord 25.0
Honda Civic 28.0
Nissan Altima 24.5
Honda CRV 22.7
Toyota Tundra 19.1
Output example:
Average MPG for Honda: [averageValue]
javascript
functions
average
Medium
javascript
function gettingAverage(list, whatMake) {
count = 0;
sum = 0;
list.forEach(e => {
if (whatMake.toUpper() === e.make.toUpper()) {
sum += e.miles;
count += 1;
}
});
if (count == 0) return 0;
return sum / count;
}
const list = [{miles: 12, make: "toy", Model: ""}, {miles: 13, make: "toy"}, {miles: 14, make: "other"}];
const whatMake = "toy";
console.log(gettingAverage(list, whatMake));a
aseer hamim
Verified User