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Changing Array length in processing works in contrary to Java that changin an Arrays length is impossible after it's creation (Although I assume in Processing it's returning a new array under the hood but it says something else though in the documentations!)
String[] sa1 = { "OH ", "NY ", "CA "};
println(sa1); // --> OH, NY, CA
println(sa1.length); // --> 3
sa1 = shorten(sa1);
println(sa1); // --> OH, NY
println(sa1.length); // --> 2
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