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    \$\begingroup\$ I think you can save 3 bytes by using parseInt(a,b) instead of parseInt(a[0],b) since parseInt converts the first argument to string and ignores everything starting at the first invalid character (i.e. ','). \$\endgroup\$ Commented Sep 23, 2016 at 8:21
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    \$\begingroup\$ I also think you can save some bytes by using a[0]?stuff():0 instead of a.length&&stuff() \$\endgroup\$ Commented Sep 23, 2016 at 8:31
  • \$\begingroup\$ @Lmis Thanks, I've updated it :) \$\endgroup\$ Commented Sep 23, 2016 at 8:44
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    \$\begingroup\$ I think you can shorten this to 40 bytes: f=([b,...a],c)=>b?parseInt(b,c)+f(a,b):0 \$\endgroup\$ Commented Sep 24, 2016 at 18:07
  • \$\begingroup\$ @Neil nice way of not using the slice function \$\endgroup\$ Commented Sep 25, 2016 at 9:59