JS: Primitive Value

Primitive Value

A primitive value is a value whose type is a primitive type.

The following values are “Primitive Values”.

• undefined
• null
• true, false
• any number (includes NaN and Infinity )
• any string [see JS: String Overview]
• any symbol [see JS: Symbol Tutorial]

[see JS: Value Types]

Primitive Value Object Wrapper

Most primitive type have corresponding object of object type.

• JS: String Object
• JS: Number Object
• JS: Boolean Object
• JS: Symbol Object

The object is used as primitive value wrapper. This allows you to call methods on them, such as "abc".length or (34).toString().

You can create number, string, boolean, objects yourself. (but is not useful to do.)

For example:

new String(arg) [see JS: String Constructor]

new Number(arg) [see JS: Number Constructor]

new Boolean(arg) [see JS: Boolean Constructor]

Convert Primitive Value to Object

Object(prim) → converts a primitive value to its corresponding object.

[see JS: Object Constructor]