string support
Strings are important in most programs, so many efficient string intrinsics are built in, including:

ASC()       Intrinsic  ASCII value of 1st character of string
CHR$()      Intrinsic  Convert number to 1 char ASCII string
CJUST$()    Intrinsic  Center justify string in field of spaces
CSIZE()     Intrinsic  Number of bytes before null character
CSIZE$()    Intrinsic  Clip string off at 1st null character
CSTRING$()  Intrinsic  Convert C string into native string
FORMAT$()   Intrinsic  Create formatted string from format spec and value
HEX$()      Intrinsic  HexaDECimal string representation of number
HEXX$()     Intrinsic  HEX$ with "0x" prefix
INCHR()     Intrinsic  Find first search-set character in string
INCHRI()    Intrinsic  Same as INCHR() except case insensitive
INFILE$()   Intrinsic  Input line of text from disk file
INLINE$()   Intrinsic  Input line of text from keyboard
INSTR()     Intrinsic  Find first substring in string
INSTRI()    Intrinsic  Same as INSTR() except case insensitive
LCASE$()    Intrinsic  Lower case of string
LCLIP$()    Intrinsic  Clip n bytes from left end of string
LEFT$()     Intrinsic  Leftmost n characters of string
LEN()       Intrinsic  # of elements in string
LJUST$()    Intrinsic  Left justify string in field of spaces
LTRIM$()    Intrinsic  Trim spaces and tabs from left of string
MID$()      Intrinsic  Extract arbitrary part of string
NULL$()     Intrinsic  Create string of n null characters
RCLIP$()    Intrinsic  Clip n bytes from right end of string
RIGHT$()    Intrinsic  Extract rightmost n characters of string
RINCHR()    Intrinsic  Same as INCHR except reverse search direction
RINCHRI()   Intrinsic  Same as RINCHR() except case insensitive
RINSTR()    Intrinsic  Same as INSTR() except reverse search direction
RINSTRI()   Intrinsic  Same as RINSTR() except case insensitive
RJUST$()    Intrinsic  Right justify string in field of spaces
RTRIM$()    Intrinsic  Trim spaces and tabs from right end of string
SPACE$()    Intrinsic  String of n space characters
STRING()    Intrinsic  Convert to type STRING... STRING$() is identical
STUFF$()    Intrinsic  Stuff one string into another
SWAP        Statement  Swap the values of numeric or string variables
TRIM$()     Intrinsic  Remove spaces and tabs from left & right of string
UCASE$()    Intrinsic  Upper case of a string