From 26a1714b1a9d8aff0a6b8b5382df4c701a3f5a54 Mon Sep 17 00:00:00 2001
From: Petro31 <35082313+Petro31@users.noreply.github.com>
Date: Mon, 10 Jan 2022 07:01:52 -0500
Subject: [PATCH] Add is_number test (#21110)

---
 .../_docs/configuration/templating.markdown   | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/source/_docs/configuration/templating.markdown b/source/_docs/configuration/templating.markdown
index 60eed9e7316..4e69c06e69e 100644
--- a/source/_docs/configuration/templating.markdown
+++ b/source/_docs/configuration/templating.markdown
@@ -208,6 +208,28 @@ The same thing can also be expressed as a filter:
 
 {% endraw %}
 
+{% raw %}
+
+```text
+{% for energy in expand('group.energy_sensors') if is_number(energy.state) %}
+  {{ energy.state }}
+  {%- if not loop.last %}, {% endif -%}
+{% endfor %}
+```
+
+{% endraw %}
+
+The same thing can also be expressed as a test:
+
+{% raw %}
+
+```text
+{{ expand('group.energy_sensors') 
+  | selectattr("state", 'is_number') | join(', ') }}
+```
+
+{% endraw %}
+
 ### Devices
 
 - `device_entities(device_id)` returns a list of entities that are associated with a given device ID. Can also be used as a filter.