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NEWS for to_indices (#19730) (#22152)
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* NEWS for to_indices (#19730)
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mbauman authored and Sacha0 committed Jun 6, 2017
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Expand Up @@ -413,6 +413,22 @@ Library improvements
that dimension's length will be computed such that its product with all the other dimensions is equal
to the length of the original array ([#19919]).
* The new `to_indices` function provides a uniform interface for index conversions,
taking an array and a tuple of indices as arguments and returning a tuple of
integers and/or arrays of supported scalar indices. It will throw an `ArgumentError`
for any unsupported indices, and the returned arrays should be iterated over (and
not indexed into) to support more efficient logical indexing ([#19730]).
+ Using colons (`:`) to represent a collection of indices is deprecated. They now must be
explicitly converted to a specialized array of integers with the `to_indices` function.
   As a result, the type of `SubArray`s that represent views over colon indices has changed.
+ Logical indexing is now more efficient. Logical arrays are converted by `to_indices` to
a lazy, iterable collection of indices that doesn't support indexing. A deprecation
provides indexing support with O(n) lookup.
+ The performance of indexing with `CartesianIndex`es is also improved in many situations.
* A new `titlecase` function was added, to capitalize the first character of each word within a string ([#19469]).
* `any` and `all` now always short-circuit, and `mapreduce` never short-circuits ([#19543]).
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