convert( expr, 'truefalseFAIL' ) attempts to convert the expression expr to one of the values true, false, or FAIL. This is intended to be used in composition with procedures that return a boolean literal that can include the value FAIL.

The argument expression expr must be an expression that can be evaluated as a boolean, resulting in one of the values true, false, or FAIL.

$\mathrm{convert}\left(2<3\&comma;'\mathrm{truefalseFAIL}'\right)$

$\mathrm{true}$

$\mathrm{convert}\left(3<2\&comma;'\mathrm{truefalseFAIL}'\right)$

$\mathrm{false}$

$\mathrm{convert}\left(1<\mathrm{I}\&comma;'\mathrm{truefalseFAIL}'\right)$

$\mathrm{FAIL}$

$\mathrm{convert}\left(a<b\&comma;'\mathrm{truefalseFAIL}'\right)$

Error, (in `convert/truefalseFAIL`) unable to convert a < b to type `truefalseFAIL'

$\mathrm{sort}\left(\left[\mathrm{posint}\&comma;\mathrm{integer}\&comma;\mathrm{numeric}\&comma;\mathrm{string}\right]\&comma;\mathrm{subtype}\right)$

$\left[\mathrm{string}\&comma;\mathrm{posint}\&comma;\mathrm{integer}\&comma;\mathrm{numeric}\right]$

The convert/truefalseFAIL command was introduced in Maple 2022.

For more information on Maple 2022 changes, see Updates in Maple 2022.