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Use the programming language you're most comfortable with if requirements are not strictly coupled to one programming language. Share your thoughts while you're coding so the interviewers can feel your way of thinking and problem-solving. Also, ask questions when something needs to be clarified for you. Try not to write pieces of code you don't fully understand, for example, using IIFE and not knowing how to pass an argument into it, using ; in front of it, and not knowing why it's used. Try to write readable code with understandable variable and function names. Avoid writing too nested statements, so it's not easy to understand the code's flow. Try to write code that is easy to cover with the tests.