Requirements

Installation

<dependencies>  <dependency>    <groupId>com.github.javadev</groupId>    <artifactId>underscore-kotlin</artifactId>    <version>1.8</version>  </dependency>  ...</dependencies>

implementation'com.github.javadev:underscore-kotlin:1.8'

Usage

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, 3U.of(1,2,3)// or java.util.Arrays.asList(1, 2, 3) or new Integer[] {1, 2, 3}    .mapMulti((num,consumer) -> {for (inti =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.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.Builderbuilder =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>  <agenumber="true">25</age>  <addressarray="true">    <streetAddress>21 2nd Street</streetAddress>    <city>New York</city>    <cityIdnull="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>

Stringinventory ="{\n"        +"\"inventory\": {\n"        +"\"#comment\":\"Test is test comment\",\n"        +"\"book\": [\n"        +"      {\n"        +"\"-year\":\"2000\",\n"        +"\"title\":\"Snow Crash\",\n"        +"\"author\":\"Neal Stephenson\",\n"        +"\"publisher\":\"Spectra\",\n"        +"\"isbn\":\"0553380958\",\n"        +"\"price\":\"14.95\"\n"        +"      },\n"        +"      {\n"        +"\"-year\":\"2005\",\n"        +"\"title\":\"Burning Tower\",\n"        +"\"author\": [\n"        +"\"Larry Niven\",\n"        +"\"Jerry Pournelle\"\n"        +"        ],\n"        +"\"publisher\":\"Pocket\",\n"        +"\"isbn\":\"0743416910\",\n"        +"\"price\":\"5.99\"\n"        +"      },\n"        +"      {\n"        +"\"-year\":\"1995\",\n"        +"\"title\":\"Zodiac\",\n"        +"\"author\":\"Neal Stephenson\",\n"        +"\"publisher\":\"Spectra\",\n"        +"\"isbn\":\"0553573862\",\n"        +"\"price\":\"7.50\"\n"        +"      }\n"        +"    ]\n"        +"  }\n"        +"}";Stringtitle =U.selectToken(U.fromJsonMap(inventory),"//book[@year>2001]/title/text()");// "Burning Tower"Stringjson ="{\n"        +"\"Stores\": [\n"        +"\"Lambton Quay\",\n"        +"\"Willis Street\"\n"        +"  ],\n"        +"\"Manufacturers\": [\n"        +"    {\n"        +"\"Name\":\"Acme Co\",\n"        +"\"Products\": [\n"        +"        {\n"        +"\"Name\":\"Anvil\",\n"        +"\"Price\": 50\n"        +"        }\n"        +"      ]\n"        +"    },\n"        +"    {\n"        +"\"Name\":\"Contoso\",\n"        +"\"Products\": [\n"        +"        {\n"        +"\"Name\":\"Elbow Grease\",\n"        +"\"Price\": 99.95\n"        +"        },\n"        +"        {\n"        +"\"Name\":\"Headlight Fluid\",\n"        +"\"Price\": 4\n"        +"        }\n"        +"      ]\n"        +"    }\n"        +"  ]\n"        +"}";List<String>names =U.selectTokens(U.fromJsonMap(json),"//Products[Price>=50]/Name/text()");// [Anvil, Elbow Grease]

XmlBuilderbuilder =XmlBuilder.create("Projects")    .e("underscore-kotlin").a("language","Java").a("scm","SVN")        .e("Location").a("type","URL")            .t("https://github.com/kotlindev/underscore-kotlin/")        .up()    .up()    .e("JetS3t").a("language","Java").a("scm","CVS")        .e("Location").a("type","URL")            .t("https://jets3t.s3.amazonaws.com/index.html");

<?xml version="1.0" encoding="UTF-8"?><Projects>    <underscore-kotlinlanguage="Java"scm="SVN">        <Locationtype="URL">https://github.com/kotlindev/underscore-kotlin/</Location>    </underscore-kotlin>    <JetS3tlanguage="Java"scm="CVS">        <Locationtype="URL">https://jets3t.s3.amazonaws.com/index.html</Location>    </JetS3t></Projects>