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  • \$\begingroup\$ I was doing it without es6, but yeah that would be 1 byte shorter, thanks. \$\endgroup\$ Commented Jul 19, 2016 at 20:07
  • \$\begingroup\$ Why would you not use lambda? \$\endgroup\$ Commented Jul 19, 2016 at 20:08
  • \$\begingroup\$ no good reason, i just haven't used it that much, so it's not my first instinct \$\endgroup\$ Commented Jul 19, 2016 at 20:09
  • \$\begingroup\$ Apparently we're allowed to return false instead of 0 (as it auto-converts to 0 in an integer expression) in which case you can drop the |0. \$\endgroup\$ Commented Jul 19, 2016 at 20:17
  • \$\begingroup\$ That would save 1 byte, but what do you mean by "it auto-converts to 0"? What is "it"? \$\endgroup\$ Commented Jul 19, 2016 at 20:21