🐛 Fix agg metrics, don't use "for .. in .." on JS arrays #1167
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Agg metrics were broken because we iterated over an array using "for .. in ..", which has unexpected consequences. "for .. in .." iterates over all the keys in an object. Arrays are a type of object, where the elements of the array are keyed by index. But they can have other properties too (like their methods) so when you use "for .. in .." you get everything. In general arrays should be iterated with "for .. of .." or ".forEach", but in this specific case I noticed we are basically just copying an array with some values substituted, so I opted for ".map". Note: There is repeated code across these two files that should obviously be refactored later, but for now I just want to get this bug fixed.
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #1167 +/- ##
==========================================
+ Coverage 30.09% 30.10% +0.01%
==========================================
Files 118 118
Lines 5203 5201 -2
Branches 1113 1162 +49
==========================================
Hits 1566 1566
+ Misses 3635 3631 -4
- Partials 2 4 +2
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By the way, the reason this issue emerged out of the blue was a bug in Transcrypt. Although using "for .. in .." on an array is less than ideal, the code was working fine like that for several releases – until we added e-mission-common which includes Transcrypt. I submitted a PR to Transcrypt that would address this: |
shankari
approved these changes
Aug 24, 2024
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Agg metrics were broken because we iterated over an array using "for .. in ..", which has unexpected consequences.
"for .. in .." iterates over all the keys in an object. Arrays are a type of object, where the elements of the array are keyed by index. But they can have other properties too (like their methods) so when you use "for .. in .." you get everything.
In general arrays should be iterated with "for .. of .." or ".forEach", but in this specific case I noticed we are basically just copying an array with some values substituted, so I opted for ".map".
Note: There is repeated code across these two files that should obviously be refactored later