This chapter lists the global statements and procedures that form the core of the twinBASIC language.

WARNING

Work in Progress Below

Categorical List

Compiler Control

Option - configure a compiler option
#If ... Then ... Else - enable or disable compilation of enclosed code

Declarations and Definitions

Class, Module - define a class or module
Sub - define a procedure
Function - define a function
Property - define a property
Enum - define an enumeration type with associated constants
Type - declare a user-defined data type (UDT)/a structure
Declare - declare an external/library procedure or function
Event - declare an event
Implements - specifies that a class implements a given interface
End - terminate execution, finish a Function, Sub, Property, or Enum definition, finish a Type declaration; finish a Class or Module, finish an If, Select, or With block

Flow Control

Statements:

Call - invokes a procedure or function
Do ... Loop, For ... Next, For Each ... Next, While ... Wend - loops
If ... Then ... Else - execute code conditionally
Continue - skip to the next iteration of the loop
Exit - exit a loop, procedure, function or property
Select Case - execute a code block selected by an expression
With - bring a variable or expression into scope
Goto, GoSub ... Return - transfer execution to another location
Resume - resumes execution after an error has been caught
On Error - specifies what to do when an error occurs
On ... GoTo, On ... GoSub - transfer execution to a location selected by an expression
Stop - interrupt execution

Variable Declaration

Statements:

Dim - declare a typed scalar or array variable
Const - declare a constant
Public - declare a public variable in a class or module
Private - declare a private variable in a class or module
Static - declare a a variable of static duration

Variable Assignment and Modification

Statements:

Let - sets the value of a variable
Set - changes the object referred by the variable
Erase - fills a fixed-size array with default values, or invalidates a dynamic array
LSet - assigns a user-defined type, or left-aligns a string
RSet - right-aligns a string
ReDim - change the size of a dynamically-sized array,

File I/O

Statements:

Open, Close - open/close a file for I/O operations
Get, Put - read/write data from an open random access file
Line Input, Print - read/write a line from/to an open text file
Input, Write - read/write data from an open sequential access file
Seek - change the current access position in an open file
Lock, Unlock - lock/unlock a range of records in an open file

Procedures:

Reset - close all open disk files
Width - set the limit for line lengths when printing
ChDir, ChDrive - change the current working directory and disk drive
MkDir, RmDir - create/remove a directory on disk
Name - rename a file or directory on disk
SetAttr - set attributes of a file on disk
FileCopy - copy a file on disk
Kill - delete a file from disk
SavePicture - write a Picture or Image to a disk file

State Management

Procedures:

Load, Unload - load/unload a form or control into memory
GetSetting, SaveSetting - retrieve/store a string value from/to the system registry
DeleteSetting - remove value from the system registry

Events and Interaction

Statements:

RaiseEvent - raise an event that may be handled by event handlers

Mathematics

Procedures:

Atn, Cos, Sin, Tan - trigonometric functions
Sqr - take a square root
Exp - calculate an exponential with base $e$
Log - calculate the natural (base $e$) logarithm of a number
Sgn - return the sign of a number
Abs - returns the absolute value of a number
Round - round the number to a given number of decimal places
Rnd - generate a random number in the range 0.0, 1.0)
Randomize - seed the random number generator

String Handling

Statements that modify strings:

Mid =, MidB = - assign to or replace characters or wide/narrow string sections

Procedures that check properties of strings:

Len$, Len, LenB$, LenB - the length of a string
Asc, AscB, AscW - returns the character code of the first letter in a string
StrComp - compares two strings
InStr$, InStrB, InStr - finds the position of a given substring in a string

Procedures that create strings:

Chr$, Chr, ChrB$, ChrB, ChrW$, ChrW - returns the character having a given code
Space$, Space - return a string of spaces
String$, String - return a string of specified characters

Procedures that return modified strings:

Left$, Left, LeftB$, LeftB - extract a left substring of a string
Mid$, Mid, MidB$, MidB- extract a substring of a string
Right$, Right, RightB$, RightB - extract a right substring of a string
LTrim$, LTrim, RTrim$, RTrim - removes leading/trailing spaces from a string
Trim$, Trim - removes leading and trailing spaces from a string
StrReverse - reverses the order of characters of a string
LCase$, LCase, RCase$, RCase - capitalizes or lowercases a string
StrConv - converts the string to a specified format
Join - concatenates a string array using a given delimiter
Split - splits a string into a string array
Replace - replaces substrings in a string
Filter - filters a string array into a subset according to criteria
InStrRev - filters a string array into a subset according to criteria
Format$, Format - format a numeric expression in a specific way
FormatNumber - formats an expression as a numeric string
FormatPercent - formats an expression as a percent string

Date and Time

Procedures:

Date, [Time - set the current date and time
FormatDateTime - formats an expression as a date/time string
MonthName - returns the name of the specified month
WeekdayName - returns the name of the specified day of the week

Financial

Procedures:

DDB - depreciation of an asset via the Double-Declining Balance method
FV - future value of an investment with constant deposits and interest
Pmt - payment for a loan with constant payments and interest
IPmt - interest payment for a loan with constant payments and interest
PPmt - principal payment for a loan with constant payments and interest
SYD - sum-of-years' digits depreciation of an asset
SLN - straight-line depreciation of an asset in one period
PV - present value of investment
IRR - internal rate of return for a series of cash flows
MIRR - modified internal rate of return for a series of cash flow
Rate - interest rate per period of an annuity
NPV - net present value of an investment
NPer - number of periods for an investment with constant deposits and interest
FormatCurrency - format an expression as a currency string

Deprecated

Statements:

DefBool, DefByte, DefInt, DefLng, DefCur, DefSng, DefDbl, DefDec, DefDate, DefStr, DefObj, DefVar - used to give implicit types to single-letter variables
Error - raise an error

Categorical List ​

Compiler Control ​

Declarations and Definitions ​

Flow Control ​

Variable Declaration ​

Variable Assignment and Modification ​

File I/O ​

State Management ​

Events and Interaction ​

Mathematics ​

String Handling ​

Date and Time ​

Financial ​

Deprecated ​

Categorical List

Compiler Control

Declarations and Definitions

Flow Control

Variable Declaration

Variable Assignment and Modification

File I/O

State Management

Events and Interaction

Mathematics

String Handling

Date and Time

Financial

Deprecated