FunctionTemplate::GetFunction

[robfig]

This allows you to instantiate a FunctionTemplate for a context.

[codecov]

Codecov Report

Merging #119 (f98921a) into master (69de0c5) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head f98921a differs from pull request most recent head 5e9dc15. Consider uploading reports for the commit 5e9dc15 to get more accurate results

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
- Coverage   96.80%   96.79%   -0.01%     
==========================================
  Files          12       12              
  Lines         438      437       -1     
==========================================
- Hits          424      423       -1     
  Misses          9        9              
  Partials        5        5              

Impacted Files	Coverage Δ
context.go	94.36% <100.00%> (ø)
function_template.go	100.00% <100.00%> (ø)
promise.go	100.00% <100.00%> (ø)

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[rogchap]

Then2 is an odd API. Can we use a variadic function and do checks for one or two FunctionCallback passed in? ie:

Suggested change

	func (p *Promise) Then2(onFulfilled, onRejected FunctionCallback) *Promise {
	func (p *Promise) Then(cbs ...FunctionCallback) *Promise {

[rogchap]

I see this PR extends #118; ideally each PR should be independent of each other and based of the master branch. Makes it harder to review just the Function code vs Promise code.

[rogchap]

Once we have #118 merged we can rebase and this PR should be good to merge too. Thanks again @robfig

[rogchap]

I've merged #118 (thanks @robfig)
Are you able to address the conflicts in this one?

[robfig]

Updated