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ES6 introduced two important new JavaScript keywords: let and const. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Before ES6 (2015), JavaScript had only Global Scope and Function Scope. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. 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Variables declared inside a { } block cannot be accessed from outside the block: Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Note: The