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Added documentation for integer range sums (#1593)

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Eli Sadoff 2019-12-10 21:25:54 -05:00 committed by Kenta Murata
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commit 7e9b1609da
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enum.c
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@ -4029,6 +4029,10 @@ int_range_sum(VALUE beg, VALUE end, int excl, VALUE init)
* { 1 => 10, 2 => 20 }.sum([]) #=> [1, 10, 2, 20] * { 1 => 10, 2 => 20 }.sum([]) #=> [1, 10, 2, 20]
* "a\nb\nc".each_line.lazy.map(&:chomp).sum("") #=> "abc" * "a\nb\nc".each_line.lazy.map(&:chomp).sum("") #=> "abc"
* *
* If the method is applied to an Integer range without a block,
* the sum is not done by iteration, but instead using Gauss's summation
* formula.
*
* Enumerable#sum method may not respect method redefinition of "+" * Enumerable#sum method may not respect method redefinition of "+"
* methods such as Integer#+, or "each" methods such as Range#each. * methods such as Integer#+, or "each" methods such as Range#each.
*/ */