don't print trailing commas

README.md

@@ -9,7 +9,7 @@ the terms of this License".
 A tiny JSON5 parsing library for Java 8, with a focus on simplicity and minimizing size.
 
 ## Usage
-First, include the library in your project. You can do this by adding the following to your build.gradle(.kts):
+First, include the library in your project. You can do this by adding the following to your `build.gradle(.kts)`:
 <details>
 <summary>Kotlin</summary>
 
@@ -90,14 +90,14 @@ This prints out:
   // comment
   "key": 4,
   // look, arrays work too!
-  "arr": [ 1, 2, 3, ],
+  "arr": [ 1, 2, 3 ],
   // and objects!
   "obj": {
-    "key": "value", 
+    "key": "value"
   },
   // comments can also
   // be multiple lines
-  "null": null,
+  "null": null
 }
 ```
 
@@ -121,7 +121,8 @@ public class Example {
 	public static void main(String[] args) {
 		Example example = new Example();
 		Map<String, ZsonValue> zson = Zson.obj2map(example);
-		System.out.println(new Zson().stringify(zson));
+		System.out.println(new Zson()
+                .withQuoteKeys(false).stringify(zson));
 	}
 }
 ```
@@ -130,8 +131,8 @@ This prints out:
 ```json5
 {
   // This is a comment
-  "key": "value",
-  "number": 4,
+  key: "value",
+  number: 4
 }
 ```
 

src/main/java/dev/nolij/zson/Zson.java

@@ -1008,7 +1008,15 @@ public void write(@NotNull Map<String, ZsonValue> data, @NotNull Path path) thro
 	public void write(@NotNull Map<String, ZsonValue> data, @NotNull Appendable output) throws IOException {
 		output.append("{\n");
 
+		boolean first = true;
+
 		for (var entry : data.entrySet()) {
+			if (first) {
+				first = false;
+			} else {
+				output.append(",\n");
+			}
+
 			ZsonValue zv = entry.getValue();
 			String comment = zv.comment;
 
@@ -1030,10 +1038,10 @@ public void write(@NotNull Map<String, ZsonValue> data, @NotNull Appendable outp
 			if (quoteKeys)
 				output.append('"');
 
-			output.append(": ").append(value(zv.value)).append(",\n");
+			output.append(": ").append(value(zv.value));
 		}
 
-		output.append("}");
+		output.append("\n}");
 	}
 
 	/**
@@ -1083,14 +1091,25 @@ private String value(Object value) {
 			StringBuilder output = new StringBuilder("[");
 			output.append(expandArrays ? "\n" : " ");
 
+			boolean first = true;
+
 			for (Object obj : iterableValue) {
-				if (expandArrays)
+				if (!first) {
+					output.append(",")
+							.append(expandArrays ? "\n" : " ");
+				} else {
+					first = false;
+				}
+
+				if (expandArrays) {
 					output.append(indent).append(indent);
-				output.append(value(obj).replace("\n", "\n" + indent + indent))
-						.append(",")
-						.append(expandArrays ? "\n" : " ");
+				}
+
+				output.append(value(obj).replace("\n", "\n" + indent + indent));
 			}
 
+			output.append(expandArrays ? "\n" : " ");
+
 			if (expandArrays)
 				output.append(indent);
 

src/test/java/NoJUnitTest.java

@@ -43,13 +43,13 @@ public static void main(String[] args) {
 		    // The state of the address
 		    "state": "IL",
 		    // The zip code of the address
-		    "zip": 62701,
+		    "zip": 62701
 		  },
 		  // The phone numbers of the person
 		  "phoneNumbers": {
 		    "home": "217-555-1234",
 		    "cell": "217-555-5678",
-		  },
+		  }
 		}""";
 
 		assert expected.equals(json);

src/test/java/ZsonTest.java

@@ -79,13 +79,13 @@ public void testReadWrite() {
 		    // The state of the address
 		    "state": "IL",
 		    // The zip code of the address
-		    "zip": 62701,
+		    "zip": 62701
 		  },
 		  // The phone numbers of the person
 		  "phoneNumbers": {
 		    "home": "217-555-1234",
-		    "cell": "217-555-5678",
-		  },
+		    "cell": "217-555-5678"
+		  }
 		}""";
 
 		assertEquals(expected, json);
@@ -190,7 +190,7 @@ public void testNumbers() {
 			"inf": Infinity,
 			"w": NaN,
 			"java": 3405691582,
-			"neginf": -Infinity,
+			"neginf": -Infinity
 		}""", new Zson().stringify(map));
 	}
 
@@ -204,7 +204,7 @@ public void testObject() {
 			"such": "amaze",
 			"very": true,
 			"constant": "wow",
-			"testEnum": "ONE",
+			"testEnum": "ONE"
 		}""";
 
 		String actual = new Zson().stringify(json);
@@ -306,7 +306,7 @@ public void testUnquotedKeys() {
 			such: "amaze",
 			very: true,
 			constant: "wow",
-			testEnum: "TWO",
+			testEnum: "TWO"
 		}""";
 
 		String actual = new Zson().withQuoteKeys(false).stringify(json);
@@ -382,7 +382,7 @@ public void testObjectFields() {
 		String expected = """
 		{
 			"a": 0,
-			"set": [ "a", "b", "c", ],
+			"set": [ "a", "b", "c" ],
 			"b": {
 				"bool": false,
 				"b": 0,
@@ -393,9 +393,9 @@ public void testObjectFields() {
 				"d": 0.0,
 				"c": "\\0",
 				"str": null,
-				"e": null,
+				"e": null
 			},
-			"c": "ONE",
+			"c": "ONE"
 		}""";
 
 		String actual = new Zson().stringify(json);