REM Create some functions and their inverses:
      DEF FNsin(a) = SIN(a)
      DEF FNasn(a) = ASN(a)
      DEF FNcos(a) = COS(a)
      DEF FNacs(a) = ACS(a)
      DEF FNcube(a) = a^3
      DEF FNroot(a) = a^(1/3)

      dummy = FNsin(1)

      REM Create the collections (here structures are used):
      DIM cA{Sin%, Cos%, Cube%}
      DIM cB{Asn%, Acs%, Root%}
      cA.Sin% = ^FNsin() : cA.Cos% = ^FNcos() : cA.Cube% = ^FNcube()
      cB.Asn% = ^FNasn() : cB.Acs% = ^FNacs() : cB.Root% = ^FNroot()

      REM Create some function compositions:
      AsnSin% = FNcompose(cB.Asn%, cA.Sin%)
      AcsCos% = FNcompose(cB.Acs%, cA.Cos%)
      RootCube% = FNcompose(cB.Root%, cA.Cube%)

      REM Test applying the compositions:
      x = 1.234567 : PRINT x, FN(AsnSin%)(x)
      x = 2.345678 : PRINT x, FN(AcsCos%)(x)
      x = 3.456789 : PRINT x, FN(RootCube%)(x)
      END

      DEF FNcompose(f%,g%)
      LOCAL f$, p%
      f$ = "(x)=" + CHR$&A4 + "(&" + STR$~f% + ")(" + \
      \             CHR$&A4 + "(&" + STR$~g% + ")(x))"
      DIM p% LEN(f$) + 4
      $(p%+4) = f$ : !p% = p%+4
      = p%