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it should be simple but str() doesnt work for some reason, even though the reference clearly states it should. would love to get some help with this.
Processing has a preference on floats over double primitive types. The community decided to support only floats so you will need to do explicit casting.
double d = 5d;
String sd = "" + d;
While @GoToLoop's solution is correct, my advice is simple - don't use doubles when using Processing. The community decided to use floats for all purposes in Processing, and you can't really use most of Processing's built in functions with doubles.