Useful Power Automate workarounds

I have been doing a fair bit of Power Automate/ Flow work recently. This post is meant to be a collection of useful hacks I find here are there:

• How to test if a variable is an integer? Smart hack, making use of the fact that a flow can continue even if one of the steps fail (this is not the default but one can set it for any action).
• Splitting a string into characters. Again, an amazing workaround! You need this because the default split operator cannot split if the separator is empty.
• From the official docs, compose and select etc. A good read on some of the less known operators. Well, less known for me at least…