diff --git a/Collections.meta b/Collections.meta
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+++ b/Collections.meta
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diff --git a/Collections/DictionaryExtensions.cs b/Collections/DictionaryExtensions.cs
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+++ b/Collections/DictionaryExtensions.cs
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+using System.Collections.Generic;
+
+namespace NEG.Utils.Collections
+{
+    public static class DictionaryExtensions
+    {
+        /// <summary>
+        /// Adds given value to a dictionary if there was no element at given <paramref name="key"/>, replaces element with <paramref name="value"> otherwise.
+        /// </summary>
+        /// <returns>true if element was added, false if it was replaced</returns>
+        public static bool AddOrUpdate<K, V>(this Dictionary<K, V> dict, K key, V value)
+        {
+            if (dict.ContainsKey(key))
+            {
+                dict[key] = value;
+                return false;
+            }
+            else
+            {
+                dict.Add(key, value);
+                return true;
+            }
+        }
+
+
+        /// <summary>
+        /// Gets a value from the dictionary under a specified key or adds it if did not exist and returns <paramref name="defaultValue"/>.
+        /// </summary>
+        /// <returns>value under a given <paramref name="key"/> if it exists, <paramref name="defaultValue"/> otherwise</returns>
+        public static V GetOrSetToDefault<K, V>(this Dictionary<K, V> dict, K key, V defaultValue)
+        {
+            if (dict.TryGetValue(key, out V value))
+            {
+                return value;
+            }
+            dict.Add(key, defaultValue);
+
+            return defaultValue;
+        }
+    }
+}
diff --git a/Collections/DictionaryExtensions.cs.meta b/Collections/DictionaryExtensions.cs.meta
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+++ b/Collections/DictionaryExtensions.cs.meta
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