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8 points by pg 5888 days ago | link | parent

Hmm, yes, so would I. I should fix that. I just did what Emmett suggested, which must have been based on Ruby, but it doesn't actually seem like a good idea.


5 points by pg 5887 days ago | link

Fixed. http://arclanguage.org/item?id=2304

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4 points by nex3 5887 days ago | link

Given this, I've changed it to 0-based reverse indexing in the Anarki.

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3 points by jules 5887 days ago | link

In Ruby you use Ranges for this.

    (1..4).to_a => [1,2,3,4]
    (1...4).to_a => [1,2,3]
str[a..b] is a substring from a to b, inclusive.

str[a...b] is a substring from a to b, exclusive.

With negative indices:

    str[a..-b] == str[a..str.length-b]
    "abcde"[1..-1] == "abcde"[1..5-1] == "abcde"[1..4] == "bcde"

    str[a...-b] == str[a...str.length-b]
    "abcde"[1...-1] == "bcd"

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1 point by carpal 5887 days ago | link

How else would you specify "the end of the string"? -1 seems natural for me. Anything else (0?) makes it kind of foggy.

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5 points by nex3 5887 days ago | link

"End of string" is specified by not passing a fourth parameter:

  > (cut "abcde" 1)
  "bcde"
See http://arclanguage.org/item?id=2267.

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2 points by maxwell 5886 days ago | link

-0

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