Web Reference: 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: A new Array A new Object A new Function A new RegExp Jul 8, 2025 · The const declaration creates an immutable reference to a value. It does not mean the value it holds is immutable — just that the variable identifier cannot be reassigned. For instance, in the case where the content is an object, this means the object's contents (e.g., its properties) can be altered. In some programming languages, const is a type qualifier (a keyword applied to a data type) that indicates that the data is read-only.
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