Hints and tips for better programming with the React Native framework

Based on my current experience with the React Native framework, I would like to share with you some hints and tips that will improve your skills in the way you develop with the framework.

Isolate the business logic of your application from the UI/ components code

This is probably the most valuable information someone should have in her mind when developing with React Native. React Native tries to be as platform independent as possible, however, there will be cases, that you will have to write different JavaScript code for iOS and different code for Android.

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A small guide on how to run your React Native app on iOS using the XCode Simulator

You decided to create a new application for iOS and you want to program the app with the React Native framework.

Here is a list with all the steps you have to take if you want to start XCode Simulator and test the UI of your application on your developer machine:

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Variable Scope - Must Know JavaScript features every programmer should learn to master the language

JavaScript is a small language, however, as any other technology one should invest some time in learning the fundamentals of it, so that she has a solid knowledge when writing code or architecting web applications.

With the Must Know JavaScript features articles I try to give you a starting point for your further familiarization with the most important features of the language. You are going to use these features extensively as a JavaScript engineer, directly or indirectly.

Let’s talk about scope

In general, the scope in a programming language affects the visibility of fields/ properties in a class/ module or of the arguments passed or the variables declared inside a function. There are two main categories of scope in the modern languages:

  • The block scope, where for example a variable is only visible inside an if condition or a for loop, when this variable is declared inside this condition. C# uses this type of scope.

  • The function scope, where a variable is visible and can be used inside the whole function. The variable remains visible only inside the function and not outside of it.

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The System.BadImageFormatException error when unit-testing in Visual Studio and its solution

The BadImageFormatException was unhandled – An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B) exception is being thrown when you try to load a .dll of your application which was compiled with 32 bits (X86) or 64 bits (X64) and the process that runs this file runs in a different bit-environment than the file.

If you see this exception when you run your C# unit tests in Visual Studio, then the reason for this error is that the test environment of Visual Studio has a different bit setting than the compiled code which is under test. To fix that you have to do the following change in your Visual Studio test settings:

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The EPERM error in npm when using TFS and Visual Studio and how to solve it

When you work with Team Foundation Server (TFS) and Visual Studio and you do web development, chances are that you will come across the EPERM error when npm tries to change a file in your application. The complete error message is Error: EPERM: operation not permitted, rename and then the absolute path to the problematic file follows.

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