From 8ec7c8eae0d647e3f8362bc4d97d45efd47dc93c Mon Sep 17 00:00:00 2001
From: Shekhar Gulati <shekhargulati84@gmail.com>
Date: Sat, 21 May 2016 18:18:21 +0530
Subject: [PATCH] Fixed #16 and #17. Added support for `prepend` and
 `prependArray` function

---
 src/main/java/strman/Strman.java     | 30 ++++++++++++++++++++++++++++
 src/test/java/strman/StrmanTest.java | 17 ++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/src/main/java/strman/Strman.java b/src/main/java/strman/Strman.java
index f26a1eb..f8e9a1e 100644
--- a/src/main/java/strman/Strman.java
+++ b/src/main/java/strman/Strman.java
@@ -624,6 +624,36 @@ public abstract class Strman {
         return value.length();
     }
 
+    /**
+     * Return a new String starting with prepends
+     *
+     * @param value    The input String
+     * @param prepends Strings to prepend
+     * @return The prepended String
+     */
+    public static String prepend(final String value, final String... prepends) {
+        return prependArray(value, prepends);
+    }
+
+    /**
+     * Return a new String starting with prepends
+     *
+     * @param value    The input String
+     * @param prepends Strings to prepend
+     * @return The prepended String
+     */
+    public static String prependArray(final String value, final String[] prepends) {
+        validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
+        if (prepends == null || prepends.length == 0) {
+            return value;
+        }
+        StringJoiner joiner = new StringJoiner("");
+        for (String prepend : prepends) {
+            joiner.add(prepend);
+        }
+        return joiner.toString() + value;
+    }
+
     public static String decode(final String value, final int digits, final int radix) {
         validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
         return Arrays
diff --git a/src/test/java/strman/StrmanTest.java b/src/test/java/strman/StrmanTest.java
index c388bfd..0a39540 100644
--- a/src/test/java/strman/StrmanTest.java
+++ b/src/test/java/strman/StrmanTest.java
@@ -481,4 +481,21 @@ public class StrmanTest {
         assertThat(leftTrim("     strman"), equalTo("strman"));
         assertThat(leftTrim("     strman  "), equalTo("strman  "));
     }
+
+    @Test
+    public void prepend_shouldPrependStrings() throws Exception {
+        assertThat(prepend("r", "f", "o", "o", "b", "a"), equalTo("foobar"));
+        assertThat(prepend("foobar"), equalTo("foobar"));
+        assertThat(prepend("", "foobar"), equalTo("foobar"));
+        assertThat(prepend("bar", "foo"), equalTo("foobar"));
+    }
+
+    @Test
+    public void prependArray_shouldPrependStrings() throws Exception {
+        assertThat(prependArray("r", new String[]{"f", "o", "o", "b", "a"}), equalTo("foobar"));
+        assertThat(prependArray("foobar", new String[0]), equalTo("foobar"));
+        assertThat(prependArray("", new String[]{"foobar"}), equalTo("foobar"));
+        assertThat(prependArray("bar", new String[]{"foo"}), equalTo("foobar"));
+    }
+
 }
\ No newline at end of file