User defined functions

These are cut-and-paste functions that you can use in your addons, submitted by Wowpedia contributors.

API
The following functions aim at extending the information WoW API provides; some are provided by specialized addons rather than being copy/pastable.
 * GetSellValue(item) - Returns an item's merchant sell price.
 * GetMinimapShape - Returns a string describing the shape of the minimap (square? round? and more)
 * allAreType(type,...) - Returns true if all the additional parameters are of the type specified.

Arguments & Returns

 * setArgs(myTable, "name", ...) - remember list of arguments to use for a callback
 * getArgs(myTable, "name", ...) - retreive stored list of arguments, plus optional extras
 * GetReturnValues(order, functionCall) - Get the return values from functionCall in any order you want.

Color Functions

 * ColorGradient(perc, R1, G1, B1, R2, G2, B2[, ...]) - Converts a percent value into a gradient from 2 or more RGB values
 * HexToRGB("string") - Converts a hex color string to RGB values (0-255)
 * HexToRGBPerc("string") - Converts a hex color string to RGB values (0.0-1.0)
 * RGBToHex(red, green, blue) - Converts a RGB value (0-255) into a hex string
 * RGBPercToHex(red, green, blue) - Converts a RGB value (0.0-1.0) into a hex string

Cursor Functions

 * GetCursorScaledPosition - Return the exact position the cursor is at based on scale.

Event Functions

 * PLAYER_MONEY - Add a message to the chat frame when you gain or spend money.

Frame Functions

 * GetQuadrant(frame) - Find which quadrant of the screen a frame lies in.
 * GetUIParentAnchor(frame) - Returns SetPoint args for the frame, anchor is relative to the nearest corner of the screen.
 * Frame:RegisterEvents(...) - Register n number of events at once.
 * Frame:UnregisterEvents(...) - Unregister n number of events at once.
 * Frame:SetManyAttributes(...) - Simple function to embed in a frame to set many atributes at once.
 * UnregisterEventFromAllFrames(event) - Tell all the frames listening for event to stop listening for it.
 * addDropDownMenuButton(uid, dropdown, index, title, usable, onClick [, hint]) - Adds a new button to a drop down (right-click popup) list of your choice.

Guild Functions

 * GuildNameToIndex(name, searchOffline) - Takes a name and converts it to their index within the guild for other guild functions.

Item Functions

 * EquipItemByLink(link) - Equips the first matching item found in the player's bags.
 * GetItemInfoDelayed(itemID or "itemString" or "itemName" or "itemLink") - Process item info, delay when necessary.

Localization Tables

 * LocalizedClassNames - Table of localized classes

Map Functions

 * GetPlayerBearing - Returns the player's current facing bearing based on minimap arrow

Menu Functions

 * Context Menu Maker - Pseudo-Class. Add/Remove menu items and show the menu when you're ready.

Metatables

 * Memorizing table - A special table that calculates values as needed and saves them into itself

Number Functions

 * round(input, n) - Round input to n places.
 * truncate(number, n) - Truncate a number to n decimal places.

Slash Function

 * GetSlashFunc - Get an existing slash command function for hooking.
 * RunSlashCmd - Passes a slash command to the chatframe
 * SlashCmdList_AddSlashCommand(name, func, ...)

String Functions

 * ChunkSplit(string [, length [, endChars]])  - Split a string into groups of "length" each ending with "endChars" (identical to the PHP function of the same name).
 * CountChars(haystack, needle)  - Return how many times needle is contained in haystack.
 * GetWords("string")  - Split words on space boundary, return table
 * printMSG("string")  - Displays a custom message to the default chat frame, for the user to see (time, code and size saver).
 * strfindt(tabCaptures, ...)  - Wrapper for strfind that returns captures in a table - can be used in if clauses!
 * StringHash("string")  - Create a fair-quality 32-bit hash of a string
 * substr("string", start [, length])  - Imp strsub. Returns a string starting from start to length characters from start (identical to the PHP function of the same name).

Table Functions

 * EraseTable(t) - Erase all values from a table
 * tinsertbeforeval(tab, valBefore, val)  - Insert one value before another (without knowing its index)
 * tremovebyval(tab, val)  - Remove a value (without knowing its index)
 * tcount(tab)  - Count table members (works on non-integer-indexed tables)
 * tcopy(tabTo, tabFrom)  - Recursively copy contents of one table to another

Time Functions

 * GameTime:Get  - Get server time including seconds and milliseconds
 * wait(delay,function [, param [,param [,...]]])  - Wait a specified amount of time before running a function with the given parameters.
 * SecondsToDays  - Converts seconds to days/hours/minutes/seconds