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  • \$\begingroup\$ 24 bytes, but outputs an array for true, null for false: Try it online! \$\endgroup\$ Commented Aug 6, 2019 at 16:52
  • \$\begingroup\$ 27 bytes s=>!s.some((x,y)=>x>s[y|1]) \$\endgroup\$ Commented Aug 7, 2019 at 5:51
  • \$\begingroup\$ @tsh Unfortunately, that would only work if you replaced > with != \$\endgroup\$ Commented Aug 7, 2019 at 15:48