Fixed #36 and fFixed #41. Added support for toCamelCase and toStudlyCasefunction

src/main/java/strman/Strman.java

@@ -976,6 +976,40 @@ public abstract class Strman {
         return append(_prefix, value, Optional.ofNullable(suffix).orElse(_prefix));
     }
 
+    /**
+     * Transform to camelCase
+     *
+     * @param value The input String
+     * @return String in camelCase.
+     */
+    public static String toCamelCase(final String value) {
+        validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
+        String str = toStudlyCase(value);
+        return str.substring(0, 1).toLowerCase() + str.substring(1);
+    }
+
+    /**
+     * Transform to StudlyCaps.
+     *
+     * @param value The input String
+     * @return String in StudlyCaps.
+     */
+    public static String toStudlyCase(final String value) {
+        validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
+        String[] words = collapseWhitespace(value.trim()).split("\\s*(_|-|\\s)\\s*");
+        return Arrays.stream(words).filter(w -> !w.trim().isEmpty()).map(w -> head(w).toUpperCase() + tail(w)).collect(joining());
+    }
+
+    /**
+     * Return tail of the String
+     *
+     * @param value The input String
+     * @return String tail
+     */
+    public static String tail(final String value) {
+        validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
+        return last(value, value.length() - 1);
+    }
 
     public static String decode(final String value, final int digits, final int radix) {
         validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);

src/test/java/strman/StrmanTest.java

@@ -714,7 +714,7 @@ public class StrmanTest {
     }
 
     @Test
-    public void surround_shouldSurrondStringWithPrefixAndSuffix() throws Exception {
+    public void surround_shouldSurroundStringWithPrefixAndSuffix() throws Exception {
         assertThat(surround("foo", "bar", null), equalTo("barfoobar"));
         assertThat(surround("shekhar", "***", null), equalTo("***shekhar***"));
         assertThat(surround("", ">", null), equalTo(">>"));
@@ -722,4 +722,22 @@ public class StrmanTest {
         assertThat(surround("f", null, null), equalTo("f"));
         assertThat(surround("div", "<", ">"), equalTo("<div>"));
     }
+
+    @Test
+    public void toCamelCase_shouldConvertStringToCamelCase() throws Exception {
+        String[] fixture = {
+                "CamelCase",
+                "camelCase",
+                "Camel case",
+                "Camel  case",
+                "camel Case",
+                "camel-case",
+                "-camel--case",
+                "camel_case",
+                "     camel_case",
+        };
+        Arrays.stream(fixture).forEach(el -> assertThat(String.format("toCameCase(%s) should be camelCase", el), toCamelCase(el), equalTo("camelCase")));
+
+        assertThat(toCamelCase("c"), equalTo("c"));
+    }
 }