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There are a few common mistakes that developers tend to make when writing JavaScript. One of the most common mistakes developers make when working with JavaScript is misusing the `this` keyword. Not using strict mode is a way to opt-in to a restricted variant of JavaScript. In strict mode, certain syntax is not allowed, and certain behaviors are changed. To avoid this mistake, make sure to use the 'this' keyword only when you're referring to the object that the current code is being executed on.