check_object_exists: Check if an object exists in a given environment
In envnames: Keep Track of User-Defined Environment Names

Description Usage Arguments Details Value

Check if an object exists in a given environment or any parent environment from the given environment in the way that the eval function does by default.

1	check_object_exists(obj, envir = globalenv())

`obj`	object to check. It can be given as a symbol or as a string.
`envir`	environment where the existence of `object` is checked.

If the object is not found in the envir environment it is searched in any parent environment of envir.

A list containing three elements:

found flag indicating whether the object was found
eval result of the evaluation of obj either in envir or in a parent environment where it was found.
address memory address of the object found. IMPORTANT: This memory address is NOT the object's memory address when the object is given as a string, as in that case the memory address contains the memory address of the string! (which varies every time, even if the string is the same, because every time the string allocates a different memory address)