Web Reference: Aug 18, 2025 · JavaScript is a "dynamically typed language", which means that, unlike some other languages, you don't need to specify what data type a variable will contain (numbers, strings, arrays, etc.). Jul 23, 2025 · JavaScript handles variables in different ways when passing them to functions. Variables in JavaScript can either be passed by value or passed by reference, depending on the type of data they hold. When a variable is passed by value, a copy of the actual value is passed to the function. Declaring JavaScript Variables Creating a variable in JavaScript is called declaring a variable. You declare a JavaScript variable with the let keyword or the const keyword.
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