Question

I have some values need to be added to an array (using initWithObjects), and encode to JSON string later.

As everyone knows, when array meet a nil, it will stop read next value.

As convention of JSON Array, the nil should be act as an null in ordered position.

Should I check every value, and manually convert it to [NSNull null] before add it to array?

Answer 1

Should I check every value, and manually convert it to [NSNull null] before add it to array?

Yes. You can create a simple helper method/function:

id GuardJSONElement(id arg) { return arg ? arg : [NSNull null]; }

and then:

[array addObject:GuardJSONElement(something)];