defined

defined(names, [type=VAR])

names is a STRING scalar/vector indicating object name(s).

type (optional) can be VAR (variable, default), SHARED (shared variable) or DEF (function definitions).

Return a scalar/vector indicating whether each element of names is defined.

x=10
y=20
def f(a){return a+1}
share table(1..3 as x, 4..6 as y) as t1;

defined(["x","y","f",`t1]);
// output
[1,1,0,0]

defined(["x","y","f",`t1], DEF);
// output
[0,0,1,0]

defined(["x","y","f",`t1], SHARED);
// output
[0,0,0,1]