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add NEWS.md entry for function composition and negation via operators #21808

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May 12, 2017
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add NEWS.md entry for function composition and negation via operators #21808

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7 changes: 7 additions & 0 deletions NEWS.md
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Expand Up @@ -350,6 +350,12 @@ Library improvements
now efficiently yield `SparseVector`s or `SparseMatrix`s as appropriate ([#19239],
[#19371], [#19518], [#19438], [#19690], [#19724], [#19926], [#19934], [#20009]).

* The operators `!` and `∘` (`\circ<tab>` at the REPL and in most code editors) now
respectively perform predicate function negation and function composition. For example,
`map(!iszero, (0, 1))` is now equivalent to `map(x -> !iszero(x), (0, 1))` and
`map(uppercase ∘ hex, 250:255)` is now equivalent to
`map(x -> uppercase(hex(x)), 250:255)` ([#17155]).

Compiler/Runtime improvements
-----------------------------

Expand Down Expand Up @@ -424,6 +430,7 @@ Deprecated or removed
[#16984]: https://github.com/JuliaLang/julia/issues/16984
[#16986]: https://github.com/JuliaLang/julia/issues/16986
[#17057]: https://github.com/JuliaLang/julia/issues/17057
[#17155]: https://github.com/JuliaLang/julia/issues/17155
[#17261]: https://github.com/JuliaLang/julia/issues/17261
[#17265]: https://github.com/JuliaLang/julia/issues/17265
[#17302]: https://github.com/JuliaLang/julia/issues/17302
Expand Down