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13. Working with Primitive String, Numbe... > You Should Typically Use Primitive S...
You Should Typically Use Primitive String, Number, and Boolean Values
The literal/primitive values that represent a string, number, or boolean are faster to write and are more concise in the literal form.
You should use the literal value because of this. Additionally, the
accuracy of the typeof operator depends
upon how you create the value (literal versus constructor invocation). If
you create a string, number, or boolean object, the typeof operator reports the type as an object.
If you use literals, the typeof
operator returns a string name of the actual value type (e.g., typeof 'foo' // returns 'string').
In the code below, I demonstrate this fact.
<!DOCTYPE html><html lang="en"><body><script> // string, number, and boolean objects console.log(typeof new String('foo')); // logs 'object' console.log(typeof new Number(1)); // logs 'object' console.log(typeof new Boolean(true)); // logs 'object' // string, number, and boolean literals/primitives console.log(typeof 'foo'); // logs 'string' console.log(typeof 1); // logs 'number' console.log(typeof true); // logs 'boolean' </script></body></html>
