Introducing Elixir by Simon St. Laurent

Author:Simon St. Laurent
Language: eng
Format: epub
ISBN: 9781449369996
Publisher: O'Reilly Media
Published: 2014-08-15T00:00:00+00:00

iex(24)> divide = fn(value, accumulator) -> value / accumulator end #Function<12.106461118/2 in :erl_eval.expr/5> iex(25)> 1/2/4/8/16/32 3.0517578125e-5 iex(26)> List.foldl(list, 1, divide) 8.0 iex(24)> 32/16/8/4/2/1 0.03125 iex(25)> List.foldr(list, 1, divide) 0.125

This code seems too simple to have a bug, so what’s going on? Table 8-1 walks through the calculations for List.foldl(list, 1, divide), and Table 8-2 walks through List.foldr(list, 1, divide) step by step.

Table 8-1. Recursive division of a list forward with List.foldl/3

Value from list Accumulator Result of division

1

1

1

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