How to apply if else condition?

I am trying to design a smart irrigation app in my academic project. In this image, I got the Average value of all sensor input but now I need to add some condition like if average < 35000 then it will generate an email notification. so I have no idea how to implement the condition. So, please help me out...

A switch allows you to do an "if" operation so instead of using JS in a function, you could add a switch node BEFORE and use the < less than compare option.

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Thank you buddy
I have tried this and put switch but it is not working so am I doing something wrong in switch..? please check it..

Is the value in msg.payload or msg.payload.avg? also are you testing a number or string?

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