is a, is not a, isn't a, is all, is not all, isn't all

Operator

Used to test whether a value is or isn't a particular type.

Examples:

The following expressions all yield true:

pi is a number

pi is not an integer

"123, 12.5" is a point

(snow is greater than rain) is a boolean

6 is a digit

"(),.;:!?[]{}%\'/" & quote is all punctuation

tab is a controlChar

"A" is an uppercase

"ABCdef" is not all uppercase

space is a blank

space tab return is all blankOrReturn