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Hello everyone, here is Arthur, today we will talk about dependency injection, letamp;#39;s begin! When you have specific problem, itamp;#39;s good first to check, if there already exists a way to solve a problem. In informatics that kind of solutionis called design pattern. They illustrate thefact that good practice allows to avoidcommon errors and problems in programming. A dependent class is what you need for another class, for example, a class thatmanages the connection with an external API needsa management class with an external connection. We can solve it the ugly way. Copy-paste across multiple classes is hard to maintain. In it anew class inside another is also a bad idea, because you can have multiple copies of thesame class at one time and have to send theirclass dependencies, if you want to add any. The solution to this problem is dependency injection. We can initialize a classwith business logic, weamp;#39;ll call it service anywhere in the code. Th