What is the best way to increase the last item of a list by one? I've come up with ++list[[Length[list]]], is there something more efficient?

  • 6
    $\begingroup$ :) ++list[[-1]] closely related: 42455 $\endgroup$
    – Kuba
    Commented Dec 7, 2015 at 19:07
  • $\begingroup$ @Kuba Thanks! Now that I know I also know I should figure out myself :D $\endgroup$ Commented Dec 7, 2015 at 20:00

1 Answer 1


In my timings with a=Range[100000]


a[[-1]] += 1

a[[-1]] = a[[-1]] + 1



a[[100000]] += 1

a[[100000]] = a[[100000]] + 1

all evaluate in the same time.


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