Swift Online Test

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About the test

The Swift online test assesses candidates' knowledge of programming in the Swift language and their ability to leverage commonly used parts of its standard library. This test requires solving live coding problems in Swift.

The assessment includes work-sample tasks such as:

  • Working with classes, objects, and protocols to write reusable code.
  • Fixing memory leaks.
  • Implementing and properly using data structures and algorithms.

A good Swift developer needs a solid understanding of the Swift programming language as well as native data structures and language constructs.

Sample public questions

10 min

Change the Readable protocol and the ReadableObject and ReadOnceObject classes so that:

  • ReadableObject and ReadOnceObject implement the Readable protocol.
  • When the read method is called on the ReadableObject class, it returns the value that it received in the constructor.
  • The isReadable method returns true in the ReadableObject class. The isReadable method of the ReadOnceObject class should return true the first time it's called, and false every time after.
5 min
Memory Management

An application uses the User and Subscription classes for tracking all subscriptions that a user has purchased. Currently, the memory occupied by instances of those classes is never reclaimed.

Without changing the public API, fix the memory leak.

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8 more premium Swift questions

Parse Numbers, Initialization, Fire Dragon, Lazy Matcher, Max Sum, Crop Rotation, Product Refactoring, Special Actions.

Skills and topics tested

  • Swift
  • Language
  • Higher Order Function
  • OOP
  • Protocols
  • Memory Management
  • Algorithmic Thinking
  • Dictionary
  • Error Handling
  • Refactoring
  • Strings

For job roles

  • Swift Developer

Sample candidate report

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