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IronJS is a JavaScript framework created by Google. It was first released in 2013 and is based on AngularJS. IronJS is designed to make it easier to build single-page applications (SPAs). It provides a number of features that are designed to make development of SPAs more efficient, including a routing system, a dependency injection system, and a template engine. Sources: - [IronJS website](https://ironjs.org/) - [Wikipedia article on IronJS](https://en.wikipedia.org/wiki/IronJS)

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

First 20 minutes

General IronJS app knowledge and experience

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

How would you describe IronJS?

IronJS is an ECMAScript 3.0 compliant JavaScript implementation for .NET built on top of the Dynamic Language Runtime.

What are some of the advantages of using IronJS?

Some advantages of using IronJS include: it's open-source, it's built on .NET's DLR, and it allows for interoperability with other .NET languages.

How would you integrate IronJS with a .NET application?

To integrate IronJS with a .NET application, you would need to add a reference to the IronJS library, then use the IronJS.Hosting namespace to create a new JavaScript environment and execute scripts.

What are the key components of IronJS?

The key components of IronJS include the IronJS compiler, the IronJS runtime, and the IronJS standard library.

Describe the difference between IronJS and Node.js.

IronJS is a JavaScript implementation for .NET, while Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. IronJS allows for interoperability with .NET languages, while Node.js is primarily used for building scalable network applications.

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What you’re looking for early on

Does the candidate have a strong understanding of IronJS?

Has the candidate demonstrated problem-solving skills during the interview?

Is the candidate able to communicate effectively about complex technical concepts?

Does the candidate have experience with other relevant technologies?

Next 20 minutes

Specific IronJS 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.

How would you handle exceptions in IronJS?

In IronJS, exceptions can be handled using try-catch blocks similar to other .NET languages. The IronJS.Hosting namespace provides a JavaScriptException class that can be used to catch exceptions thrown by JavaScript code.

What are some of the limitations of IronJS?

Some limitations of IronJS include: it only supports ECMAScript 3.0, it doesn't support all JavaScript libraries, and it may have performance issues compared to native JavaScript engines.

Describe the difference between IronJS and JScript.NET.

IronJS and JScript.NET are both JavaScript implementations for .NET. However, IronJS is built on the DLR and is open-source, while JScript.NET is a Microsoft product and is not built on the DLR.

How would you debug an IronJS application?

Debugging an IronJS application can be done using standard .NET debugging tools. You can also use console.log statements in your JavaScript code to output debug information.

What are the steps to compile and run a JavaScript file using IronJS?

To compile and run a JavaScript file using IronJS, you would first need to create a new JavaScript environment using the IronJS.Hosting namespace. Then, you can use the ExecuteFile method to run the JavaScript file.

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At this point, a skilled IronJS engineer should demonstrate strong problem-solving abilities, proficiency in IronJS 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 IronJS.

What does the following IronJS code do?
var x = 5; var y = 10; var z = x + y;
This code declares two variables, x and y, assigns them the values 5 and 10 respectively, and then adds those two values together and assigns the result to a third variable, z. The value of z will be 15.
What will be the output of the following IronJS code?
var x = 'Iron'; var y = 'JS'; console.log(x + ' ' + y);
This code concatenates the strings 'Iron' and 'JS' with a space in between and logs the result to the console. The output will be 'Iron JS'.
What does the following IronJS code do?
var arr = [1, 2, 3, 4, 5]; var sum = 0; for (var i = 0; i < arr.length; i++) { sum += arr[i]; }
This code declares an array of numbers and a variable to hold the sum. It then uses a for loop to iterate over the array and add each number to the sum. At the end of the loop, the sum variable will hold the total of all the numbers in the array.
What will be the output of the following IronJS code?
var x = 0; function increment() { x++; } increment(); console.log(x);
This code declares a variable x and a function that increments x. It then calls the function and logs the value of x to the console. The output will be 1, because the function increment() increases the value of x by one.

Wrap-up questions

Final candidate for IronJS 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 IronJS application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you call a .NET method from JavaScript code in IronJS?

To call a .NET method from JavaScript code in IronJS, you would first need to import the .NET namespace using the importNamespace function. Then, you can call the .NET method directly from your JavaScript code.

Describe the difference between IronJS and V8.NET.

IronJS and V8.NET are both JavaScript implementations for .NET. However, IronJS is built on the DLR and is open-source, while V8.NET is a wrapper around Google's V8 engine and is not built on the DLR.

How would you implement multithreading in IronJS?

IronJS does not natively support multithreading. However, you can use .NET's threading capabilities to run multiple JavaScript environments in parallel.

IronJS application related

Product Perfect's IronJS development capabilities

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

IronJS Consultive assessments

IronJS Application Conversion Assessment IronJS Application Integration Assessment IronJS Data & Database Integration Assessment

Custom IronJS development projects

Custom IronJS App Conversion IronJS Custom App Development Process App UI Design for IronJS Facelifts

Hiring guide for IronJS Engineers

IronJS Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

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

IronJS Consultive assessments

Custom IronJS development projects