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Editorial Team
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Asked: 2026-06-05T01:44:53+00:00

Of the five primitive JavaScript data types ( string , number , boolean ,

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Of the five primitive JavaScript data types (string, number, boolean, null and undefined), the first three have associated constructors:

new String("Hello!")
new Number(40)
new Boolean(true)

The constructed objects are wrappers for the object literals. In particular, new String("Hello!") === "Hello!" evaluates to false.

Are there a similar constructors for the null and undefined primitive data types that produce object wrappers different from the corresponding object literal?

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1 Answer

  1. Editorial Team

    No, there are not, and it wouldn’t make sense considering the “values” they represent.

    Ignore the fact that typeof null === ‘object’

    According to MDN:

    JavaScript automatically converts primitives and String objects, so that it's
possible to use String object methods for primitive strings.

    The interpreter just does some magical auto-wrapping of primitive in classes if you call a method that affects the primitive, like charAt.

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