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3 points by jules 2389 days ago | link | parent

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"