From 22f794125fd5f7adbdf7c77458f08c4f421f007c Mon Sep 17 00:00:00 2001
From: santpent <44591078+santpent@users.noreply.github.com>
Date: Fri, 2 Nov 2018 12:24:52 +0000
Subject: [PATCH] add command substition indexing examples (#5303)

* add command substition indexing examples

following from issue #243

* Update index.hdr.in
---
 doc_src/index.hdr.in | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/doc_src/index.hdr.in b/doc_src/index.hdr.in
index d3eb664b2..12eeeb994 100644
--- a/doc_src/index.hdr.in
+++ b/doc_src/index.hdr.in
@@ -671,8 +671,19 @@ set n -3
 echo $PATH[$n..-1]
 \endfish
 
-Note that variables can be used as indices for expansion of variables, but not command substitution.
+Variables can be used as indices for expansion of variables, like so:
+\fish
+set index 2
+set letters a b c d
+echo $letters[$index] # returns 'b'
+\endfish
+However using variables as indices for command substitution is currently not supported, so 
+\fish
+echo (seq 5)[$index] # This won't work
 
+set sequence (seq 5) # It needs to be written on two lines like this.
+echo $sequence[$index] # returns '2'
+\endfish
 
 \subsection expand-home Home directory expansion