The topics are:

The null value is a special value used in some places to specify an absence of information. For example, an array element which hasn't been set yet has a default null value. The null value is not to be confused with the undefined value, which also specifies an absence of information in some contexts.

The null value can be referenced in programs with the keyword null:

  null −> the null value

When converted to a number, null yields 0.

The only method of null is: