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Reference · stzString

IsAFunction()

IsAFunction: is the content the name of a DEFINED function (per the original monolith: functions() lookup)? The call-looking check is IsAlmostAFunctionCall.

also written: IsFunc · IsAFunctionName

Basic examples (1)

Softanza
# stzLen is a function
? Q("stzLen").IsFunction()
# stzChar is a class
? Q("stzChar").IsClass()
Output
1
1

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 471_isafunction.ring(opens in a new tab) · written IsAClass() in the library today: the host language already holds IsClass(), and Haro removes the detour; written IsAFunction() in the library today: the host language already holds IsFunction(), and Haro removes the detour

The extensions of this method

Each extension, and whether it exists for this method; an extension that exists combines with the others (FindSTCS).

Extension
Exists
What it adds · The names
Q
no
does what the method does, then returns the object, so the call can be chained
QQ
no
chains on the next, more specific type of object (the Q ladder)
QQQ
no
chains on the most specific type of object (the Q ladder)
QRT
no
returns the result as an object of the requested type
CS
no
takes a case-sensitivity flag
ST
no
takes the position to start from (StartingAt)
IB
no
takes bounds that are included (IncludingBounds)
XT
no
the extended form: more parameters than the base method
XTT
no
yet another extension: a further extended form, after XT
Z
no
includes the position in what it returns
ZZ
no
returns positions as sections, [start, end]
W
no
selects by a condition
WF
no
selects by a condition, with the expressive keywords (@NextItem, @PreviousItem...)
D
no
takes a direction, forward or backward (Directional)
F
no
takes a function (the condition or the update is given as a function); the forms document also uses F for the future form, which defers the action
Many
no
works on a collection of items instead of one (the plural form)
Except
no
takes exceptions, what to leave out (the exceptional form)
U
no
returns the result without duplication

Every example is a test file of the library, run inside the library for this page; only those whose output kept every promise their file wrote are shown.

See also