Добавлены функции joinToString для массива и joining для stream

examples/forms/textarea.own

@@ -1,6 +1,6 @@
 use ["std", "forms", "functional"]
 
-text = join(map(range(1, 16), def(x) = "line " + x), "\n")
+text = map(range(1, 16), def(x) = "line " + x).joinToString("\n")
 label = newLabel()
 textArea = newTextArea(text)
 textArea.addCaretListener(def(event) = updateInfo())

src/main/java/com/annimon/ownlang/lib/ArrayValue.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.exceptions.TypeException;
 import java.util.Arrays;
 import java.util.Iterator;
@@ -48,6 +49,17 @@ public class ArrayValue implements Value, Iterable<Value> {
         return result;
     }
     
+    public static StringValue joinToString(ArrayValue array, String delimiter, String prefix, String suffix) {
+        final StringBuilder sb = new StringBuilder();
+        for (Value value : array) {
+            if (sb.length() > 0) sb.append(delimiter);
+            else sb.append(prefix);
+            sb.append(value.asString());
+        }
+        sb.append(suffix);
+        return new StringValue(sb.toString());
+    }
+    
     private final Value[] elements;
 
     public ArrayValue(int size) {
@@ -96,13 +108,31 @@ public class ArrayValue implements Value, Iterable<Value> {
 
             // Functions
             case "isEmpty":
-                return NumberValue.fromBoolean(size() == 0);
+                return Converters.voidToBoolean(() -> size() == 0);
+            case "joinToString":
+                return new FunctionValue(this::joinToString);
 
             default:
                 return get(index.asInt());
         }
     }
     
+    public Value joinToString(Value[] args) {
+        Arguments.checkRange(0, 3, args.length);
+        switch (args.length) {
+            case 0: 
+                return joinToString(this, "", "", "");
+            case 1:
+                return joinToString(this, args[0].asString(), "", "");
+            case 2:
+                return joinToString(this, args[0].asString(), args[1].asString(), args[1].asString());
+            case 3:
+                return joinToString(this, args[0].asString(), args[1].asString(), args[2].asString());
+            default:
+                throw new ArgumentsMismatchException("Wrong number of arguments");
+        }
+    }
+
     public void set(int index, Value value) {
         elements[index] = value;
     }

src/main/java/com/annimon/ownlang/modules/functional/functional_stream.java

@@ -8,7 +8,7 @@ import java.util.Arrays;
 public final class functional_stream implements Function {
 
     @Override
-    public Value execute(Value... args) {
+    public Value execute(Value[] args) {
         Arguments.checkAtLeast(1, args.length);
 
         if (args.length > 1) {
@@ -52,10 +52,11 @@ public final class functional_stream implements Function {
             set("reduce", wrapTerminal(new functional_reduce()));
             set("forEach", wrapTerminal(new functional_foreach()));
             set("toArray", args -> container);
+            set("joining", container::joinToString);
             set("count", args -> NumberValue.of(container.size()));
         }
 
-        private Value skip(Value... args) {
+        private Value skip(Value[] args) {
             Arguments.check(1, args.length);
 
             final int skipCount = args[0].asInt();
@@ -71,7 +72,7 @@ public final class functional_stream implements Function {
             return new StreamValue(new ArrayValue(result));
         }
 
-        private Value limit(Value... args) {
+        private Value limit(Value[] args) {
             Arguments.check(1, args.length);
 
             final int limitCount = args[0].asInt();
@@ -87,7 +88,7 @@ public final class functional_stream implements Function {
             return new StreamValue(new ArrayValue(result));
         }
 
-        private Value sorted(Value... args) {
+        private Value sorted(Value[] args) {
             Arguments.checkOrOr(0, 1, args.length);
             final Value[] elements = container.getCopyElements();
 
@@ -106,7 +107,7 @@ public final class functional_stream implements Function {
             return new StreamValue(new ArrayValue(elements));
         }
 
-        private Value custom(Value... args) {
+        private Value custom(Value[] args) {
             Arguments.check(1, args.length);
             final Function f = ValueUtils.consumeFunction(args[0], 0);
             final Value result = f.execute(container);

src/main/java/com/annimon/ownlang/modules/std/std_join.java

@@ -5,7 +5,6 @@ import com.annimon.ownlang.exceptions.TypeException;
 import com.annimon.ownlang.lib.Arguments;
 import com.annimon.ownlang.lib.ArrayValue;
 import com.annimon.ownlang.lib.Function;
-import com.annimon.ownlang.lib.StringValue;
 import com.annimon.ownlang.lib.Types;
 import com.annimon.ownlang.lib.Value;
 
@@ -21,26 +20,15 @@ public final class std_join implements Function {
         final ArrayValue array = (ArrayValue) args[0];
         switch (args.length) {
             case 1:
-                return join(array, "", "", "");
+                return ArrayValue.joinToString(array, "", "", "");
             case 2:
-                return join(array, args[1].asString(), "", "");
+                return ArrayValue.joinToString(array, args[1].asString(), "", "");
             case 3:
-                return join(array, args[1].asString(), args[2].asString(), args[2].asString());
+                return ArrayValue.joinToString(array, args[1].asString(), args[2].asString(), args[2].asString());
             case 4:
-                return join(array, args[1].asString(), args[2].asString(), args[3].asString());
+                return ArrayValue.joinToString(array, args[1].asString(), args[2].asString(), args[3].asString());
             default:
                 throw new ArgumentsMismatchException("Wrong number of arguments");
         }
     }
-    
-    private static StringValue join(ArrayValue array, String delimiter, String prefix, String suffix) {
-        final StringBuilder sb = new StringBuilder();
-        for (Value value : array) {
-            if (sb.length() > 0) sb.append(delimiter);
-            else sb.append(prefix);
-            sb.append(value.asString());
-        }
-        sb.append(suffix);
-        return new StringValue(sb.toString());
-    }
 }

src/test/resources/modules/functional/stream.own

@@ -43,6 +43,13 @@ def testCustom() {
   assertEquals([5,6,4,2], stream(data).custom(::reverse).toArray())
 }
 
+def testJoining() {
+  data = [1,2,3,4]
+  assertEquals("1234", stream(data).joining())
+  assertEquals("1-2-3-4", stream(data).joining("-"))
+  assertEquals("<1-2-3-4>", stream(data).joining("-", "<", ">"))
+}
+
 def testPeek() {
   data = [2,3,4,5,6,7]
   expected = [2,4,6]

src/test/resources/other/arrayFunctions.own

@@ -22,5 +22,11 @@ def testGetLengthInnerArray() {
 
 def testIsEmpty() {
   arr = [1, 2, 3]
-  assertFalse(arr.isEmpty)
+  assertFalse(arr.isEmpty())
+}
+
+def testJoinToString() {
+  arr = [1, 2, 3]
+  assertEquals("123", arr.joinToString())
+  assertEquals("1 2 3", arr.joinToString(" "))
 }