Export the isinvertible and inverse functions (#287)

* Export the 'isinvertible' and 'inverse' functions

* Update docs/src/index.md

---------

Co-authored-by: Júlio Hoffimann <[email protected]>

docs/make.jl

@@ -6,7 +6,7 @@ using TransformsBase
 DocMeta.setdocmeta!(TableTransforms, :DocTestSetup, :(using TableTransforms); recursive=true)
 
 makedocs(;
-  warnonly=[:missing_docs, :cross_references],
+  warnonly=[:missing_docs],
   modules=[TableTransforms, TransformsBase],
   authors="Júlio Hoffimann <[email protected]> and contributors",
   repo="https://github.com/JuliaML/TableTransforms.jl/blob/{commit}{path}#{line}",

docs/src/index.md

@@ -150,6 +150,39 @@ Using the cache we can revert the transform:
 original = revert(transform, newtable, cache)
 ```
 
+### Inverting transforms
+
+Some transforms have an inverse that can be created with the [`inverse`](@ref) function.
+The function [`isinvertible`](@ref) can be used to check if a transform is invertible.
+
+```@docs
+inverse
+isinvertible
+```
+
+Let's exemplify this:
+
+```@example usage
+a = [5.1, 1.5, 9.4, 2.4]
+b = [7.6, 6.2, 5.8, 3.0]
+c = [6.3, 7.9, 7.6, 8.4]
+table = (; a, b, c)
+```
+
+Choose a transform and check that it is invertible:
+
+```@example usage
+transform = Functional(exp)
+isinvertible(transform)
+```
+
+Now, let's test the inverse transform:
+
+```@example usage
+invtransform = inverse(transform)
+invtransform(transform(table))
+```
+
 ### Reapplying transforms
 
 Finally, it is sometimes useful to [`reapply`](@ref) a transform that was

src/TableTransforms.jl

@@ -43,9 +43,11 @@ export
 
   # interface
   isrevertible,
+  isinvertible,
   apply,
   revert,
   reapply,
+  inverse,
 
   # built-in
   Assert,