<ul><li>JavaScript variables can hold different types of values, such as numbers and strings.</li><li>Array behavior in JavaScript can be unexpected, and it is recommended to use Array.from({ length: 3 }) for dense arrays.</li><li>Coercion can be used to convert values between types, simplifying code, but it should be used carefully to avoid bugs.</li><li>Understanding JavaScript's grammar rules and operator precedence is crucial to prevent confusion and subtle bugs.</li></ul>

Demystifying JavaScript Types, Values, and Grammar: Key Insights from You Don’t Know JS

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