From 1d0d39b2d39070a9ece7377fbd8a304a968839fb Mon Sep 17 00:00:00 2001
From: Dmitriy Gusev <d.o.gusev@gmail.com>
Date: Tue, 19 Mar 2019 11:53:33 +0200
Subject: [PATCH 1/2] Indexes of array items and array length

---
 .../2019-03-19-indexes-and-length-of-array.md | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/shared/md/2019-03-19-indexes-and-length-of-array.md

diff --git a/src/shared/md/2019-03-19-indexes-and-length-of-array.md b/src/shared/md/2019-03-19-indexes-and-length-of-array.md
new file mode 100644
index 00000000..a43f2cb0
--- /dev/null
+++ b/src/shared/md/2019-03-19-indexes-and-length-of-array.md
@@ -0,0 +1,38 @@
+**Never add items to array usin indexes. Never trust them!**
+
+Lets create an empty array, and check its length is `0`
+```
+  var arr = [];
+  arr.length; // 0
+```
+
+Lets add something to its first place:
+
+```
+  arr[0] = 'I am the first';
+  arr.length; // 1
+```
+
+Oh, what if...
+
+```
+  arr[15] = 'actually, i am the second';
+  arr.length; // 16
+```
+
+***WTF?***
+
+Array actually looks like
+```
+["I am the first", empty × 14, "actually, i am the second"]
+```
+
+** Explanation **
+
+This is how array's `.length` works. It takes index of the last elemnt, and returns `index+1`.
+
+Use native array methods to add items to it: `push`, `unshift`.
+
+— [@dogusev][1]
+
+[1]:https://github.com/dogusev
\ No newline at end of file

From fcd3b7f5ae5ad843ea333d93ccac802231a4ba58 Mon Sep 17 00:00:00 2001
From: Dmitriy Gusev <d.o.gusev@gmail.com>
Date: Thu, 21 Mar 2019 19:31:14 +0200
Subject: [PATCH 2/2] more example added

---
 .../md/2019-03-19-indexes-and-length-of-array.md       | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/shared/md/2019-03-19-indexes-and-length-of-array.md b/src/shared/md/2019-03-19-indexes-and-length-of-array.md
index a43f2cb0..ea5081fd 100644
--- a/src/shared/md/2019-03-19-indexes-and-length-of-array.md
+++ b/src/shared/md/2019-03-19-indexes-and-length-of-array.md
@@ -9,13 +9,23 @@ Lets create an empty array, and check its length is `0`
 Lets add something to its first place:
 
 ```
+  var arr = []
   arr[0] = 'I am the first';
   arr.length; // 1
 ```
 
 Oh, what if...
 
+
+```
+  var arr = []
+  arr[3] = 'I am the first';
+  arr.length; // 4
 ```
+
+```
+  var arr = []
+  arr[0] = 'I am the first';
   arr[15] = 'actually, i am the second';
   arr.length; // 16
 ```