is_callable [function]

is_callable( var )

returns whether the variable var is callable - a function (func/cfunc) or an object with OP_CALL defined

• this function is equivalent to sgs_IsCallable in the C API

is_callable( print ); // returns 'true'
is_callable( function(){} ); // returns 'true'
is_callable( 5 ); // returns 'false'