diff --git a/ROADMAP.md b/ROADMAP.md
index 9a2a2ce..d55a68e 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -7,8 +7,8 @@
 - [ ] methods for arrays
 - [ ] methods for strings
 - [ ] methods for objects
-- [ ] writing objects to a variable
-- [x] yaml support?
+- [x] writing objects to a variable
+- [x] yaml support
 - [ ] command execution function
 - [ ] function for random
 - [x] delete variable
@@ -16,6 +16,7 @@
 - [ ] checking variable type
 - [x] checking for the existence of a variable
 - [x] create scopes without if, else, loop
-- [ ] calculate values in arrays
+- [x] calculate values in arrays
+- [x] References for variables in variables
 
 and something else
diff --git a/doc/main.md b/doc/main.md
index 3b92161..0ab3c2c 100644
--- a/doc/main.md
+++ b/doc/main.md
@@ -90,6 +90,34 @@ works only with numbers (and variables with number type)
       calculated: { calc: [{ var: "num" }, "*", 4] }, //result 8
     },
   },
+
+  {
+    let: {
+      referenceVar: { ref: "calculated" },
+    },
+    //creates a reference variable, when the "calculated"
+    // is changed, "referenceVar" will also be changed, in the
+    // future it will be possible to change "referenceVar"
+    // and the "calculated" will be changed
+  },
+
+  {
+    let: {
+      array: { arr: [{ var: "num" }, 4] }, //create calculated array result [2, 4]
+    },
+  },
+
+  {
+    let: {
+      objVar: { obj: { var: "num" } }, //create object (hashmap) variable result {var: "num"}
+    },
+  },
+
+  {
+    let: {
+      wrongObjVar: { var: "num" }, //result 2
+    },
+  },
 ]
 ```
 
diff --git a/examples/example.json5 b/examples/example.json5
index 1a13054..4700c96 100644
--- a/examples/example.json5
+++ b/examples/example.json5
@@ -132,6 +132,21 @@
       str: "A",
       num: 2,
       arr: ["Array", "in", "variable"],
+      obj: {
+        obj: {
+          arr: ["i'm array", "!"],
+          string: "I'm string!",
+          calculated: { calc: [2, "*", 2] },
+        },
+      },
+    },
+  },
+
+  {
+    let: {
+      calcArr: {
+        arr: ["Some str", { var: "num" }],
+      },
     },
   },
 
@@ -142,15 +157,19 @@
   },
 
   [
-    "Created 4 variables with values:\n",
+    "Created 6 variables with values:\n",
     "str = ",
     { var: "str" },
     "\nnum = ",
     { var: "num" },
     "\narr = ",
     { var: "arr" },
+    "\nobj = ",
+    { toString: { var: "obj" } },
     "\ncalculated (num * 4) = ",
     { var: "calculated" },
+    '\ncalculated array ["Some str", num] = ',
+    { var: "calcArr" },
   ],
 
   "Execute calculated = calculated + 1",
@@ -175,7 +194,7 @@
         loop: [
           {
             if: {
-              condition: { comp: [{ var: "num" }, ">=", 100000] },
+              condition: { comp: [{ var: "num" }, ">=", 10000] },
               body: ["break"],
             },
           },
@@ -204,7 +223,7 @@
       },
       {
         if: {
-          condition: { comp: [{ var: "calculated" }, ">=", 100000] },
+          condition: { comp: [{ var: "calculated" }, ">=", 10000] },
           body: ["\n", "break"],
         },
       },
@@ -213,17 +232,17 @@
 
   {
     if: {
-      condition: { comp: [{ var: "calculated" }, ">=", 99999] },
-      body: [["сalculated is >= ", 99999]],
-      else: [["сalculated is < ", 99999]],
+      condition: { comp: [{ var: "calculated" }, ">=", 9999] },
+      body: [["сalculated is >= ", 9999]],
+      else: [["сalculated is < ", 9999]],
     },
   },
 
   {
     if: {
-      condition: { comp: [{ var: "calculated" }, ">", 100000] },
-      body: [["сalculated is > ", 100000]],
-      else: [["сalculated is <= ", 100000]],
+      condition: { comp: [{ var: "calculated" }, ">", 10000] },
+      body: [["сalculated is > ", 10000]],
+      else: [["сalculated is <= ", 10000]],
     },
   },
 
@@ -262,5 +281,25 @@
       name: { input: "Your name: " },
     },
   },
-  { print: ["Bye, ", { var: "name" }, "!"] },
+  ["Hey, ", { var: "name" }, "!"],
+
+  "Check a var references",
+  '\nCreate variable refToName with reference variable "name"',
+  {
+    let: {
+      refToName: { ref: "name" },
+    },
+  },
+
+  ["refToName = ", { var: "refToName" }],
+
+  "Try assign name with new value",
+  {
+    assign: {
+      name: { input: "Any name: " },
+    },
+  },
+  "",
+  ["name = ", { var: "name" }],
+  ["refToName = ", { var: "refToName" }],
 ]