Web Reference: JavaScript const variables must be assigned a value when they are declared: When to use JavaScript const? Always declare a variable with const when you know that the value should not be changed. Use const when you declare: The keyword const is a little misleading. It does not define a constant value. It defines a constant reference to a value. Jul 8, 2025 · Many style guides (including MDN's) recommend using const over let whenever a variable is not reassigned in its scope. This makes the intent clear that a variable's type (or value, in the case of a primitive) can never change. Others may prefer let for non-primitives that are mutated. Dec 11, 2016 · Using const when the variable's¹ value is not meant to change accomplishes a few things: It tells others reading your code that you don't intend the value to change. It gives you a nice proactive error if you change the code so it writes to that variable.
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