Coverage index

Every built-in function and language feature is demonstrated in at least one worked example in this guide. This index maps each one to the chapter(s) that show it, so you can jump straight to a usage. For the precise definition of any entry, follow it to the reference or specification.

Chapter numbers: 1 Reacting to events · 2 Talking and messaging · 3 Finding things · 4 Inspecting entities · 5 Numbers, text, and logic · 6 Variables and memory · 7 Changing the world · 8 Combat and death · 9 Structuring scripts.

Predicates

Built-in	Chapters
`exists`	4, 7
`isnull`	3, 4, 6
`ismob`	3, 4
`isplayer`	1, 3, 6, 8
`isobj`	4
`isfighting`	4, 8
`isholding`	4
`iswearing`	4
`hastag`	6
`random`	5, 8
`keyword`	1, 3, 6
`abbrev`	1
`streqi`	1, 5, 9
`isabbrev`	5
`location`	4
`cansee`	3

Entity queries and accessors

Built-in	Chapters
`name`	2, 3, 4 (and throughout)
`vnum`	7
`level`	1, 5, 9
`room`	3, 4, 7
`class`	4, 5
`alignment`	4
`gen`	4
`position`	4, 8
`carrier`	4
`he`	2
`him`	2
`his`	2
`hour`	4, 7
`moonphase`	4

Collection producers

Built-in	Chapters
`creatures`	3, 6, 8, 9
`people`	3, 6
`objects`	3, 4
`contents`	3
`inventory`	4
`equipment`	3
`implants`	3
`tattoos`	3
`fighting`	8
`alias`	3
`words`	3, 5, 9
`list`	5

Iterable consumers

Built-in	Chapters
`empty`	3, 8
`first`	3, 4, 8
`nth`	3
`count`	3, 4, 8, 9
`ismember`	3
`hasabbrev`	3
`choose`	3, 5
`each`	3, 6, 9
`every`	3
`some`	3, 8
`select`	3, 9
`slice`	3

Math, string, and conversion

Built-in	Chapters
`int`	5
`randrange`	5
`substr`	5
`upper`	5, 9
`lower`	5

Prototype retrieval

Built-in	Chapters
`mob`	7
`object`	7

Action commands

Built-in	Chapters
`do`	1, 2 (and throughout)
`force`	2
`silently`	2
`echo`	1, 2 (and throughout)
`emit`	2
`ldesc`	2, 7
`damage`	8
`spell`	8
`giveexp`	8
`award`	8
`oload`	7
`mload`	7
`opurge`	7
`selfpurge`	7
`trans`	7
`stepto`	7
`walkto`	7
`driveto`	7
`doorset`	7
`doorexit`	7
`mobflag`	7
`tag`	6
`untag`	6

Operators

Operator	Chapters
`+` `-` `*` `/` `%`	5 (also `+` in 6, 9)
`eq`	4, 6, 8 (and throughout)
`ne`	5
`gt`	5, 9
`lt`	4, 5
`ge`	1, 5, 9
`le`	5
`not`	5, 6
`and`	5
`or`	5

(All operators are catalogued in Operators.)

Declarations, statements, and control flow

Form	Chapters
`let`	5, 6, 9 (and throughout)
`set`	6, 9
`const` (local)	6
`const` (top-level)	9
`def`	9
`store`	6
`recall`	6
`forget`	6
`if` / `elif` / `else`	1, 4, 5
`return`	9
`break`	9
`continue`	9
`require`	1, 3, 4, 8
`unless`	3, 4, 8
`halt`	1
`pause`	9
`nuke`	9
`randomly`	2

Language features

Feature	Chapters
Comments (`#`)	1, 9 (and throughout)
Integer literals	5
Boolean literals (`true` / `false`)	5
Bareword string literals	5
Single-quoted strings (`'…'`)	2
Double-quoted / interpolated strings (`"…"`)	2 (and throughout)
Braced interpolation (`${name}`)	2
Escapes (`\n`, `\$`, `\[`, …)	2
List literal (`( … )`)	3, 5
Blocks (`{ … }`)	throughout
Block parameters (`<x>`)	3, 9 (and throughout)
Multiple parameters (`<a b>`)	9
Rest parameter (`<…rest>`)	9
Implicit block return (last statement)	9
Variable reference (`$name`)	throughout
Command reference (`&name`)	3, 4, 5, 9
Command substitution (`[ … ]`)	throughout
Expression statement (`[expr]`)	9
Threading operator (`/>`)	3, 6, 9
Handler phases (`before` / `handle` / `after`)	1
Events and filters	1 (also 7, 8)
Bound variables (`$self`, `$actor`, `$arg`, `$args`, `$object`, `$spell`, `$killer`)	1 (also 2, 4, 7, 8)
Guards (`require` / `unless`)	1
Suppression / interception	1, 7
Self-suppression	1
Lexical scope and shadowing	6
Two namespaces (command vs variable)	6
Hoisting of top-level declarations	9
The type set	4