function-prefix.md

Function Prefix

A function prefix is one of more words at the start of a function name.

For example:

• the is in isValue()
• the mustBe in mustBeValue()

We use function prefixes to tell the end-user what kind of work a function does.

For example:

• anything starting with is is a type guard
• anything starting with mustBe is a type guarantee
• anything starting with make is a smart constructor

and so on.