3 ms·

Teacher here. All my students eventually try {} + {}. I'll bet on it to be the most intuitive.

• mar77i 8y ago
  Students are supposed to set things on fire and find various nifty features for learning's sake. But with experience - and the discovery that various such features largely overlap (eg. + and .extend()), one tends to grow out of that stance and become wiser.
• rplnt 8y ago
  It's intuitive to try, but it's not obvious what it actually does when keys overlap.
  • mixmastamyk 8y ago
    It’s obvious what you want done, and thankfully that is what’s going to be done.
• rurban 8y ago
  the problem with overloading add is that add results in more than merge. merge is add minus the duplicate keys. students shouldn't learn wrong semantics. {1:,2:} + {1:,3:} = {1:,2:,3:}