is_null

is_not_null

assert_is_null

assert_is_not_null

Lots of predicates (is_* functions) to check the state of your
variables, and assertions (assert_* functions) to throw errors if they
aren't in the right form.

Richard Cotton

assertive

Readable Check Functions to Ensure Code Integrity

is_null function

is_null: Checks to see if the input is (not) null.

Description

Arguments