Where is the complete documentaiton of all the operators I can use?

[vipreshjha]

Some examples of each and every operators would also help
For eg.
I mean I want to include generate an property in output only if the data has value or else I want to ignore that property in template.

How do I call JS functions, also how do I call functions of third party library included in My source??

[tuanh118]

This might help https://selecttransform.github.io/site/transform.html