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"so the example provided to delete all waypoints should be" - no it shouldn't. The example shows how to delete ALL waypoints, your example doesn't do this. Please edit your note killzone_kid (talk) 18:06, 17 November 2019 (CET)
I have modified it per your request (and corrected a mistake I made when copy/pasting from my code editor) but it is not necessary to remove waypoint with index 0 (tested it before posting)
- In order to empty waypoints array for a group you need to iterate through every waypoint, if you iterate through one less, the 1st one is never removed, not sure how you tested your code killzone_kid (talk) 20:33, 17 November 2019 (CET)