diff --git a/src/TwigExtension.php b/src/TwigExtension.php
index 99e810d..31e6f3d 100644
--- a/src/TwigExtension.php
+++ b/src/TwigExtension.php
@@ -63,6 +63,7 @@ class TwigExtension extends \Twig_Extension {
       new \Twig_SimpleFilter('check_markup', [$this, 'checkMarkup']),
       new \Twig_SimpleFilter('truncate', [$this, 'truncate']),
       new \Twig_SimpleFilter('view', [$this, 'view']),
+      new \Twig_SimpleFilter('with', [$this, 'with']),
     ];
     // PHP filter should be enabled in settings.php file.
     if (Settings::get('twig_tweak_enable_php_filter')) {
@@ -647,6 +648,24 @@ class TwigExtension extends \Twig_Extension {
     return Unicode::truncate($string, $max_length, $wordsafe, $add_ellipsis, $min_wordsafe_length);
   }
 
+  /**
+   * Adds new element to the array.
+   *
+   * @param array $build
+   *   The renderable array to add the child item.
+   * @param int|string $key
+   *   The key of the new element.
+   * @param mixed $element
+   *   The element to add.
+   *
+   * @return array
+   *   The modified array.
+   */
+  public function with(array $build, $key, $element) {
+    $build[$key] = $element;
+    return $build;
+  }
+
   /**
    * Returns a render array for entity, field list or field item.
    *
diff --git a/tests/src/Functional/TwigTweakTest.php b/tests/src/Functional/TwigTweakTest.php
index 6de13da..603e93b 100644
--- a/tests/src/Functional/TwigTweakTest.php
+++ b/tests/src/Functional/TwigTweakTest.php
@@ -231,6 +231,10 @@ class TwigTweakTest extends BrowserTestBase {
     $xpath = '//div[@class = "tt-truncate" and text() = "Hello…"]';
     $this->assertByXpath($xpath);
 
+    // Test 'with'.
+    $xpath = '//div[@class = "tt-with"]/b[text() = "Example"]';
+    $this->assertByXpath($xpath);
+
     // Test node view.
     $xpath = '//div[@class = "tt-node-view"]/article[contains(@class, "node--view-mode-default")]/h2[a/span[text() = "Beta"]]';
     $xpath .= '/following-sibling::footer[//h4[text() = "Member for"]]';
diff --git a/tests/twig_tweak_test/templates/twig-tweak-test.html.twig b/tests/twig_tweak_test/templates/twig-tweak-test.html.twig
index a371a5d..c22c0cc 100644
--- a/tests/twig_tweak_test/templates/twig-tweak-test.html.twig
+++ b/tests/twig_tweak_test/templates/twig-tweak-test.html.twig
@@ -52,6 +52,7 @@
   <div class="tt-transliterate">{{ 'Привет!' | transliterate('ru') }}</div>
   <div class="tt-check-markup">{{ '<b>bold</b> <strong>strong</strong>' | check_markup('twig_tweak_test') }}</div>
   <div class="tt-truncate">{{ 'Hello world!'|truncate(10, true, true) }}</div>
+  <div class="tt-with">{{ {'#markup':'Example'}|with('#prefix', '<b>')|with('#suffix', '</b>') }}</div>
   <div class="tt-node-view">{{ node|view }}</div>
   <div class="tt-field-list-view">{{ node.title|view }}</div>
   <div class="tt-field-item-view">{{ node.title[0]|view }}</div>