JavaScript's evolution with ES6 introduces features that enhance development efficiency and readability. Key ES6 features include arrow functions, which provide concise syntax and lexical binding of `this`; classes, simplifying object-oriented programming; template literals, enhancing string manipulation; destructuring, simplifying value extraction; modules, improving code organization; and Promises/async-await, revolutionizing asynchronous operations. Best practices involve using `const` and `let` instead of `var` for block-scoped variables, writing modular code, maintaining consistent coding style with tools like ESLint, embracing asynchronous patterns, using arrow functions appropriately, and preferring default parameters and rest/spread operators. Mastering these features and practices enhances code quality and keeps developers ahead in modern web development.
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