add hasKey() methods

core/src/processing/data/FloatDict.java

@@ -246,6 +246,11 @@ public class FloatDict {
   }
 
 
+  public boolean hasKey(String key) {
+    return index(key) != -1;
+  }
+
+
 //  /** Increase the value of a specific key by 1. */
 //  public void inc(String key) {
 //    inc(key, 1);

core/src/processing/data/IntDict.java

@@ -235,6 +235,11 @@ public class IntDict {
   }
 
 
+  public boolean hasKey(String key) {
+    return index(key) != -1;
+  }
+
+
   /** Increase the value of a specific key by 1. */
   public void increment(String key) {
     add(key, 1);

core/src/processing/data/StringDict.java

@@ -215,6 +215,11 @@ public class StringDict {
   }
 
 
+  public boolean hasKey(String key) {
+    return index(key) != -1;
+  }
+
+
   protected void create(String key, String value) {
     if (count == keys.length) {
       keys = PApplet.expand(keys);