Product Perfect

Elixir Maps is a functional programming language designed for building scalable and maintainable applications. It was created by José Valim in 2011, who sought to improve the Ruby language's performance and concurrency. Elixir Maps operates on the Erlang virtual machine (BEAM), which provides it with high fault-tolerance and low-latency system capabilities. The language is known for its metaprogramming allowing macro definitions, pattern matching, immutable data types, and first-class functions. Elixir Maps also offers tooling that aids in building systems used in distributed computing environments.

Ask the right questions secure the right Elixir Maps talent among an increasingly shrinking pool of talent.

First 20 minutes

General Elixir Maps app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in Elixir Maps application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

What is the basic syntax to create a map in Elixir?

The basic syntax to create a map in Elixir is %{key => value}. For example, %{"name" => "John", "age" => 30}.

How would you access a value from a map in Elixir?

You can access a value from a map using the map[key] syntax. For example, map["name"] would return "John" if the map is %{"name" => "John", "age" => 30}.

What are the two ways to update a map in Elixir?

You can update a map in Elixir using the Map.put/3 function or the %{map | key => value} syntax.

Describe the difference between Map.put/3 and Map.update/4 functions in Elixir.

Map.put/3 is used to add a new key-value pair or update an existing key-value pair in a map. Map.update/4 is used to update the value of an existing key, and if the key does not exist, a default value is added.

How would you merge two maps in Elixir?

You can merge two maps in Elixir using the Map.merge/2 function.

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What you’re looking for early on

Does the candidate have a strong understanding of Elixir Maps?

Has the candidate demonstrated problem-solving skills?

Can the candidate effectively communicate technical concepts?

Does the candidate have experience with other relevant technologies?

Next 20 minutes

Specific Elixir Maps development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

What is the purpose of the Map.keys/1 function in Elixir?

The Map.keys/1 function is used to get a list of all keys in a map.

What is the purpose of the Map.values/1 function in Elixir?

The Map.values/1 function is used to get a list of all values in a map.

How would you check if a map contains a specific key in Elixir?

You can check if a map contains a specific key using the Map.has_key?/2 function.

What is the purpose of the Map.drop/2 function in Elixir?

The Map.drop/2 function is used to remove specified keys and their associated values from a map.

What is the purpose of the Map.split/2 function in Elixir?

The Map.split/2 function is used to split a map into two maps based on a set of keys.

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At this point, a skilled Elixir Maps engineer should demonstrate strong problem-solving abilities, proficiency in Elixir Maps programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with Elixir Maps.

What does the following Elixir code do?
{:ok, map} = Map.new([{"key", "value"}])
This code creates a new map with a single key-value pair. The key is 'key' and the value is 'value'. It uses the Map.new/1 function of Elixir's Map module.
What will be the output of the following Elixir code?
Map.put(%{foo: 1}, :bar, 2)
The output of this code will be a map with two key-value pairs: %{foo: 1, bar: 2}. The Map.put/3 function is used to add a new key-value pair to the map.
What does the following Elixir code do?
Map.split(%{a: 1, b: 2, c: 3, d: 4}, [:a, :b])
This code splits the original map into two maps based on the keys specified in the list [:a, :b]. The first map contains the key-value pairs for keys :a and :b, and the second map contains the remaining key-value pairs.
What does the following Elixir code do?
Task.async(fn -> Map.put(%{a: 1}, :b, 2) end)
This code uses Elixir's Task module to run a new process that adds the key-value pair :b, 2 to the map %{a: 1}. The Task.async/1 function returns a Task struct that can be awaited on.

Wrap-up questions

Final candidate for Elixir Maps Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle Elixir Maps application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you convert a map to a list in Elixir?

You can convert a map to a list using the Map.to_list/1 function.

What is the purpose of the Map.from_struct/1 function in Elixir?

The Map.from_struct/1 function is used to convert a struct to a map.

How would you use pattern matching with maps in Elixir?

You can use pattern matching with maps in Elixir by specifying a pattern in the form %{key => value} on the left side of the = operator.

Elixir Maps application related

Product Perfect's Elixir Maps development capabilities

Beyond hiring for your Elixir Maps engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in Elixir Maps projects, and can engage in multiple capacities.

Elixir Maps Consultive assessments

Elixir Maps Application Conversion Assessment Elixir Maps Application Integration Assessment Elixir Maps Data & Database Integration Assessment

Custom Elixir Maps development projects

Custom Elixir Maps App Conversion Elixir Maps Custom App Development Process App UI Design for Elixir Maps Facelifts

Hiring guide for Elixir Maps Engineers

Elixir Maps Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

What you’re looking to see on the Elixir Maps engineer at this point.

Elixir Maps Consultive assessments

Custom Elixir Maps development projects