moving out outdated js docs

olddocs/js/code.md

@@ -0,0 +1,31 @@
+# function
+
+A function with inputs and outputs.
+
+### @parent js/language
+ 
+
+To add a **functions** to your script, click the `script` button, then click the `+` `add new function` button
+
+### functions
+
+A **function** takes [inputs](/actionparameters), runs code and (optionally) returns an output.
+
+TouchDevelop functions are similar to `mathematical functions`. Consider the function that computes the square of `x`: `square(x) = x*x`. In code, it would look like this:
+
+```
+export function square(x: number) : number {
+    let result: number
+    return x * x
+    return result
+}
+```
+
+### private function
+
+An function can be marked as **private** in the properties. A private function is not visible outside a library (if the script is a library)
+
+### documentation
+
+The comment(s) at the beginning of a function used to provide a description of its purpose. This text will show in the help area when the function is called from the code editor. This is particularly useful for [libraries](/libraries).
+