# Blockly rubber ducking

**URL:** <https://discourse.nodered.org/t/blockly-rubber-ducking/93289>\
**Category:** General\
**Created:** [20 November 2024 10:10 UTC](https://discourse.nodered.org/t/blockly-rubber-ducking/93289 "2024-11-20T10:10:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![cymplecy](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/cymplecy/32/2773_2.png) [@cymplecy](https://discourse.nodered.org/u/cymplecy)\
**Post date:** [20 November 2024 10:10 UTC](https://discourse.nodered.org/t/blockly-rubber-ducking/93289/1 "2024-11-20T10:10:49Z")

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This is driving me nuts

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/f/e/feb6b776ee3a6ea6bfe2ca97d7c21b05b9327144.png)  
Can anyone see a reason why msg.hashtag = "" ??

If I set var hashtag to "test" - then it gets output as test

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**Author:** ![cymplecy](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/cymplecy/32/2773_2.png) [@cymplecy](https://discourse.nodered.org/u/cymplecy)\
**Post date:** [20 November 2024 10:24 UTC](https://discourse.nodered.org/t/blockly-rubber-ducking/93289/2 "2024-11-20T10:24:15Z")

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Rubber ducking has worked - hashtagEnd was not correctly calculated at this point (I adjusted its value further down the script) and was \< hashtagStart hence reason for substring being = "" 🙂

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [4 December 2024 10:24 UTC](https://discourse.nodered.org/t/blockly-rubber-ducking/93289/3 "2024-12-04T10:24:36Z")

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