Awesome
underscore-kotlin
Requirements
Koltin 1.9, Java 11 and later or Java 17
Installation
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>1.7</version>
</dependency>
...
</dependencies>
Gradle configuration:
implementation 'com.github.javadev:underscore-kotlin:1.7'
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, 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.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.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>
String inventory =
"{\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"
+ "}";
String title = U.selectToken(U.fromJsonMap(inventory), "//book[@year>2001]/title/text()");
// "Burning Tower"
String json =
"{\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]
Simplify XML document creation by structuring your code like the final document.
This code:
XmlBuilder builder = 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");
Generates the following XML document:
<?xml version="1.0" encoding="UTF-8"?>
<Projects>
<underscore-kotlin language="Java" scm="SVN">
<Location type="URL">https://github.com/kotlindev/underscore-kotlin/</Location>
</underscore-kotlin>
<JetS3t language="Java" scm="CVS">
<Location type="URL">https://jets3t.s3.amazonaws.com/index.html</Location>
</JetS3t>
</Projects>
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.