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Why Can't I Add Properties to a String Primitive?
JavaScript has eight language types: seven primitive types and one non-primitive type (Object). Primitive values (e.g., string, number) are immutable and cannot have properties assigned to them.
When assigning a property to a variable, JavaScript determines the behavior based on the variable's type:
In the provided example, test is a string primitive, so assigning a property to it has no effect:
<code class="js">var test = "test"; test.test = "test inner"; console.log(test); // "test" console.log(test.test); // undefined</code>
Workarounds for Sorting Dates
Instead of adding properties to strings, consider the following workarounds for sorting dates in the grid:
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