add appendUnique() to Int/Float/StringList

core/src/processing/data/FloatList.java

@@ -285,6 +285,14 @@ public class FloatList implements Iterable<Float> {
   }
 
 
+  /** Add this value, but only if it's not already in the list. */
+  public void appendUnique(float value) {
+    if (!hasValue(value)) {
+      append(value);
+    }
+  }
+
+
 //  public void insert(int index, int value) {
 //    if (index+1 > count) {
 //      if (index+1 < data.length) {

core/src/processing/data/IntList.java

@@ -254,6 +254,14 @@ public class IntList implements Iterable<Integer> {
   }
 
 
+  /** Add this value, but only if it's not already in the list. */
+  public void appendUnique(int value) {
+    if (!hasValue(value)) {
+      append(value);
+    }
+  }
+
+
 //  public void insert(int index, int value) {
 //    if (index+1 > count) {
 //      if (index+1 < data.length) {

core/src/processing/data/StringList.java

@@ -314,6 +314,14 @@ public class StringList implements Iterable<String> {
   }
 
 
+  /** Add this value, but only if it's not already in the list. */
+  public void appendUnique(String value) {
+    if (!hasValue(value)) {
+      append(value);
+    }
+  }
+
+
 //  public void insert(int index, int value) {
 //    if (index+1 > count) {
 //      if (index+1 < data.length) {