diff --git a/kotlin-jsonq.iml b/kotlin-jsonq.iml
new file mode 100644
index 0000000..0f693b6
--- /dev/null
+++ b/kotlin-jsonq.iml
@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.id=":kotlin-jsonq" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" type="JAVA_MODULE" version="4">
+  <component name="FacetManager">
+    <facet type="android-gradle" name="Android-Gradle">
+      <configuration>
+        <option name="GRADLE_PROJECT_PATH" value=":kotlin-jsonq" />
+      </configuration>
+    </facet>
+    <facet type="java-gradle" name="Java-Gradle">
+      <configuration>
+        <option name="BUILD_FOLDER_PATH" value="$MODULE_DIR$/build" />
+        <option name="BUILDABLE" value="true" />
+      </configuration>
+    </facet>
+    <facet type="kotlin-language" name="Kotlin">
+      <configuration version="3" platform="JVM 1.8" useProjectSettings="false">
+        <compilerSettings />
+        <compilerArguments>
+          <option name="destination" value="$MODULE_DIR$/build/classes/kotlin/main" />
+          <option name="noStdlib" value="true" />
+          <option name="noReflect" value="true" />
+          <option name="moduleName" value="kotlin-jsonq" />
+          <option name="jvmTarget" value="1.8" />
+          <option name="addCompilerBuiltIns" value="true" />
+          <option name="loadBuiltInsFromDependencies" value="true" />
+          <option name="languageVersion" value="1.1" />
+          <option name="apiVersion" value="1.1" />
+          <option name="pluginOptions">
+            <array />
+          </option>
+          <option name="pluginClasspaths">
+            <array />
+          </option>
+        </compilerArguments>
+      </configuration>
+    </facet>
+  </component>
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
+    <output url="file://$MODULE_DIR$/build/classes/java/main" />
+    <output-test url="file://$MODULE_DIR$/build/classes/java/test" />
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/kotlin" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/kotlin" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/resources" type="java-test-resource" />
+      <excludeFolder url="file://$MODULE_DIR$/.gradle" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" exported="" scope="PROVIDED" name="kotlin-stdlib-jre8-1.1.4-3" level="project" />
+    <orderEntry type="library" exported="" scope="PROVIDED" name="minimal-json-0.9.5" level="project" />
+    <orderEntry type="library" exported="" scope="PROVIDED" name="kotlin-stdlib-jre7-1.1.4-3" level="project" />
+    <orderEntry type="library" exported="" scope="PROVIDED" name="kotlin-stdlib-1.1.4-3" level="project" />
+    <orderEntry type="library" exported="" scope="PROVIDED" name="annotations-13.0" level="project" />
+    <orderEntry type="library" exported="" scope="RUNTIME" name="kotlin-stdlib-jre8-1.1.4-3" level="project" />
+    <orderEntry type="library" exported="" scope="RUNTIME" name="minimal-json-0.9.5" level="project" />
+    <orderEntry type="library" exported="" scope="RUNTIME" name="kotlin-stdlib-jre7-1.1.4-3" level="project" />
+    <orderEntry type="library" exported="" scope="RUNTIME" name="kotlin-stdlib-1.1.4-3" level="project" />
+    <orderEntry type="library" exported="" scope="RUNTIME" name="annotations-13.0" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="kotlin-stdlib-jre8-1.1.4-3" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="minimal-json-0.9.5" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="junit-4.12" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="kotlin-stdlib-jre7-1.1.4-3" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="kotlin-stdlib-1.1.4-3" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="hamcrest-core-1.3" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="annotations-13.0" level="project" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/src/main/kotlin/ninja/sakib/jsonq/ext/JsonArrayExt.kt b/src/main/kotlin/ninja/sakib/jsonq/ext/JsonArrayExt.kt
index 574adb1..73c011d 100644
--- a/src/main/kotlin/ninja/sakib/jsonq/ext/JsonArrayExt.kt
+++ b/src/main/kotlin/ninja/sakib/jsonq/ext/JsonArrayExt.kt
@@ -2,6 +2,7 @@ package ninja.sakib.jsonq.ext
 
 import com.eclipsesource.json.Json
 import com.eclipsesource.json.JsonArray
+import com.eclipsesource.json.JsonObject
 import com.eclipsesource.json.JsonValue
 import ninja.sakib.jsonq.utils.*
 
@@ -169,3 +170,24 @@ fun JsonArray.max(key: String): JsonValue {
 fun JsonArray.avg(key: String): Double {
     return this.sum(key) / this.size()
 }
+
+fun JsonArray.count(): Int {
+    return size()
+}
+
+fun JsonArray.select(vararg key: String): JsonArray {
+    val res = JsonArray()
+    for (j in this) {
+        val jObject = j as JsonObject
+        val json = JsonObject()
+        for (k in key) {
+            val v = jObject.get(k)
+            if (v != null) {
+                json.add(k, v)
+            }
+        }
+        res.add(json)
+    }
+    return res
+}
+