Is it possible to test a variable to see if it is a primitive?
I have seen lots of questions about testing an variable to see if it is an object, but not testing for a primitive.
This question is academic, I don't actually need to perform this test from my own code. I'm just trying to get a deeper understanding of JavaScript.
To test for any primitive:
function isPrimitive(test) {
return test !== Object(test);
}
Example:
isPrimitive(100); // true
isPrimitive(new Number(100)); // false
; after a function declaration (as opposed to a function expression like var isPrimitive = function(test) {...};).
Object accepts an argument and returns if it is an object, or returns an object otherwise.
Then, you can use a strict equality comparison, which compares types and values.
If value was an object, Object(value) will be the same object, so value === Object(value). If value wasn't an object, value !== Object(value) because they will have different types.
So you can use
Object(value) !== value
typeof myVar !== 'object' && typeof myVar !== 'string'...?typeofoperator