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Koltin 2.1, Java 11 and later or Java 17
To configure your Maven project, add the following code to your pom.xml file:
<dependencies> <dependency> <groupId>com.github.javadev</groupId> <artifactId>underscore-kotlin</artifactId> <version>1.13</version> </dependency> ... </dependencies>
Gradle configuration:
implementation 'com.github.javadev:underscore-kotlin:1.13'U.of(/* array | list | set | map | anything based on Iterable interface */) .filter(..) .map(..) ... .sortWith() .forEach(..); U.of(value1, value2, value3)... U.range(0, 10)... U.of(1, 2, 3) // or java.util.Arrays.asList(1, 2, 3) or new Integer[] {1, 2, 3} .filter(v -> v > 1) // 2, 3 .map(v -> v + 1) // 3, 4 .sortWith((a, b) -> b.compareTo(a)) .forEach(System.out::println); // 4, 3 U.of(1, 2, 3) // or java.util.Arrays.asList(1, 2, 3) or new Integer[] {1, 2, 3} .mapMulti((num, consumer) -> { for (int i = 0; i < num; i++) { consumer.accept("a" + num); } }) .forEach(System.out::println); // "a1", "a2", "a2", "a3", "a3", "a3" U.formatXml("<a><b>data</b></a>", Xml.XmlStringBuilder.Step.TWO_SPACES); // <a> // <b>data</b> // </a> U.formatJson("{\"a\":{\"b\":\"data\"}}", Json.JsonStringBuilder.Step.TWO_SPACES); // { // "a": { // "b": "data" // } // } U.xmlToJson( "<mydocument has=\"an attribute\">\n" + " <and>\n" + " <many>elements</many>\n" + " <many>more elements</many>\n" + " </and>\n" + " <plus a=\"complex\">\n" + " element as well\n" + " </plus>\n" + "</mydocument>", Json.JsonStringBuilder.Step.TWO_SPACES); // { // "mydocument": { // "-has": "an attribute", // "and": { // "many": [ // "elements", // "more elements" // ] // }, // "plus": { // "-a": "complex", // "#text": "\n element as well\n " // } // }, // "#omit-xml-declaration": "yes" // } U.xmlToJsonMinimum( "<data>\n" + " <string>Example Text</string>\n" + " <integer>42</integer>\n" + " <float>3.14</float>\n" + " <boolean>true</boolean>\n" + " <date>2025年02月26日</date>\n" + " <time>14:30:00</time>\n" + " <datetime>2025年02月26日T14:30:00Z</datetime>\n" + " <array>Item 1</array>\n" + " <array>Item 2</array>\n" + " <object>\n" + " <key1>Value 1</key1>\n" + " <key2>Value 2</key2>\n" + " </object>\n" + " <null/>\n" + "</data>\n", Json.JsonStringBuilder.Step.TWO_SPACES); // { // "data": { // "string": "Example Text", // "integer": "42", // "float": "3.14", // "boolean": "true", // "date": "2025-02-26", // "time": "14:30:00", // "datetime": "2025-02-26T14:30:00Z", // "array": [ // "Item 1", // "Item 2" // ], // "object": { // "key1": "Value 1", // "key2": "Value 2" // }, // "null": "" // } // } U.jsonToXml( "{\n" + " \"mydocument\": {\n" + " \"-has\": \"an attribute\",\n" + " \"and\": {\n" + " \"many\": [\n" + " \"elements\",\n" + " \"more elements\"\n" + " ]\n" + " },\n" + " \"plus\": {\n" + " \"-a\": \"complex\",\n" + " \"#text\": \"\\n element as well\\n \"\n" + " }\n" + " },\n" + " \"#omit-xml-declaration\": \"yes\"\n" + "}", Xml.XmlStringBuilder.Step.TWO_SPACES); // <mydocument has="an attribute"> // <and> // <many>elements</many> // <many>more elements</many> // </and> // <plus a="complex"> // element as well // </plus> // </mydocument> U.jsonToXmlMinimum( "{\n" + " \"data\": {\n" + " \"string\": \"Example Text\",\n" + " \"integer\": \"42\",\n" + " \"float\": \"3.14\",\n" + " \"boolean\": \"true\",\n" + " \"date\": \"2025年02月26日\",\n" + " \"time\": \"14:30:00\",\n" + " \"datetime\": \"2025年02月26日T14:30:00Z\",\n" + " \"array\": [\n" + " \"Item 1\",\n" + " \"Item 2\"\n" + " ],\n" + " \"object\": {\n" + " \"key1\": \"Value 1\",\n" + " \"key2\": \"Value 2\"\n" + " },\n" + " \"null\": \"\"\n" + " }\n" + "}", Xml.XmlStringBuilder.Step.TWO_SPACES); // <data> // <string>Example Text</string> // <integer>42</integer> // <float>3.14</float> // <boolean>true</boolean> // <date>2025年02月26日</date> // <time>14:30:00</time> // <datetime>2025年02月26日T14:30:00Z</datetime> // <array>Item 1</array> // <array>Item 2</array> // <object> // <key1>Value 1</key1> // <key2>Value 2</key2> // </object> // <null string="true"/> // </data> U.Builder builder = U.objectBuilder() .add("firstName", "John") .add("lastName", "Smith") .add("age", 25) .add("address", U.arrayBuilder() .add(U.objectBuilder() .add("streetAddress", "21 2nd Street") .add("city", "New York") .addNull("cityId") .add("state", "NY") .add("postalCode", "10021"))) .add("phoneNumber", U.arrayBuilder() .add(U.objectBuilder() .add("type", "home") .add("number", "212 555-1234")) .add(U.objectBuilder() .add("type", "fax") .add("number", "646 555-4567"))); System.out.println(builder.toJson()); System.out.println(builder.toXml());
{ "firstName": "John", "lastName": "Smith", "age": 25, "address": [ { "streetAddress": "21 2nd Street", "city": "New York", "cityId": null, "state": "NY", "postalCode": "10021" } ], "phoneNumber": [ { "type": "home", "number": "212 555-1234" }, { "type": "fax", "number": "646 555-4567" } ] }
<?xml version="1.0" encoding="UTF-8"?> <root> <firstName>John</firstName> <lastName>Smith</lastName> <age number="true">25</age> <address array="true"> <streetAddress>21 2nd Street</streetAddress> <city>New York</city> <cityId null="true"/> <state>NY</state> <postalCode>10021</postalCode> </address> <phoneNumber> <type>home</type> <number>212 555-1234</number> </phoneNumber> <phoneNumber> <type>fax</type> <number>646 555-4567</number> </phoneNumber> </root>
Simplify XML document creation by structuring your code like the final document.
This code:
XmlBuilder builder = XmlBuilder.create("Projects") .e("underscore-java").a("language", "Java").a("scm", "SVN") .e("Location").a("type", "URL") .t("https://github.com/javadev/underscore-java/") .up() .up() .e("JetS3t").a("language", "Java").a("scm", "CVS") .e("Location").a("type", "URL") .t("https://jets3t.s3.amazonaws.com/index.html"); System.out.println(builder.toXml(Xml.XmlStringBuilder.Step.TWO_SPACES)); System.out.println(builder.toJson(Json.JsonStringBuilder.Step.TWO_SPACES));
Generates the following XML and JSON documents:
<?xml version="1.0" encoding="UTF-8"?> <Projects> <underscore-java language="Java" scm="SVN"> <Location type="URL">https://github.com/javadev/underscore-java/</Location> </underscore-java> <JetS3t language="Java" scm="CVS"> <Location type="URL">https://jets3t.s3.amazonaws.com/index.html</Location> </JetS3t> </Projects>
{
"Projects": {
"underscore-java": {
"-language": "Java",
"-scm": "SVN",
"Location": {
"-type": "URL",
"#text": "https://github.com/javadev/underscore-java/"
}
},
"JetS3t": {
"-language": "Java",
"-scm": "CVS",
"Location": {
"-type": "URL",
"#text": "https://jets3t.s3.amazonaws.com/index.html"
}
}
}
}Underscore-kotlin is a kotlin port of Underscore.js.
In addition to porting Underscore's functionality, Underscore-kotlin includes matching unit tests.
For docs, license, tests, and downloads, see: https://javadev.github.io/underscore-java
Thanks to Jeremy Ashkenas and all contributors to Underscore.js.