The call type(expr, environmentvariable) returns true if expr is an environment variable.

If an environment variable is assigned a value, you need to protect it from evaluation when passing it to the type command. You can do this using unevaluation quotes.

For internal reasons, the ditto operators %, %%, and %%%, which are environment variables, cannot be passed to the type command without being evaluated. As a consequence, this command will not detect them as environment variables.

$\mathrm{type}\left(6\,\mathrm{environmentvariable}\right)$

$\mathrm{false}$

$\mathrm{type}\left('x'\,\mathrm{environmentvariable}\right)$

$\mathrm{false}$

$\mathrm{type}\left('\mathrm{Order}'\,\mathrm{environmentvariable}\right)$

$\mathrm{true}$

$\mathrm{type}\left(\mathrm{Order}\,\mathrm{environmentvariable}\right)$

$\mathrm{false}$

The type/environmentvariable command was introduced in Maple 2021.

For more information on Maple 2021 changes, see Updates in Maple 2021.