Instagram / IGListKit / 2078 / 2
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coverage: 95.319% (-0.1%) from 95.461%
DESTINATION="OS=10.3.1,name=iPhone 7" SDK="$IOS_SDK" SCHEME="$IOS_SCHEME" RUN_TESTS="YES" RUN_UI_TESTS="NO" BUILD_EXAMPLE="YES" POD_LINT="NO", Gemfile

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facebook-github-bot 
<a href="https://github.com/Instagram/IGListKit/commit/afd2d29ee">Add diffing optimization when result is all deletes or inserts

Summary:
In an attempt to best other diffing libraries, I noticed that pure insert/delete diffing results would be almost 5x slower than changes between existing arrays. This is pretty much a benchmarking enhancement, but improves diffing performance by ~5x when the from-array or to-array is empty.

```
// OLD only inserts
avg: 0.007469, min: 0.006998, max: 0.016550, p50: 0.007254, p75: 0.007712, p90: 0.007899, p95: 0.008345, p99: 0.016550
// NEW
avg: 0.001392, min: 0.001256, max: 0.006772, p50: 0.001289, p75: 0.001348, p90: 0.001533, p95: 0.001614, p99: 0.006772
```

```
// OLD only deletes
avg: 0.005821, min: 0.005669, max: 0.006511, p50: 0.005766, p75: 0.005852, p90: 0.006030, p95: 0.006204, p99: 0.006511
// NEW
avg: 0.001184, min: 0.001096, max: 0.001673, p50: 0.001123, p75: 0.001212, p90: 0.001378, p95: 0.001467, p99: 0.001673
```

Note the average time improvements (seconds).

Benchmarking done on a 4s w/ this project:
https://pxl.cl/bLBB

Reviewed By: manicakes

Differential Revision: D6968683

fbshipit-source-id: </a><a class="double-link" href="https://github.com/Instagram/IGListKit/commit/0d8e058f0">0d8e058f0</a>

12564 of 13181 relevant lines covered (95.32%)

255.03 hits per line

Source Files on job 2078.2 (DESTINATION="OS=10.3.1,name=iPhone 7" SDK="$IOS_SDK" SCHEME="$IOS_SCHEME" RUN_TESTS="YES" RUN_UI_TESTS="NO" BUILD_EXAMPLE="YES" POD_LINT="NO", Gemfile)