Merge pull request #38 from fink-lang/empty-elem

feat(array): add support for larix empty elem

src/lang/conditionals/attempt.fnk

@@ -25,6 +25,7 @@ transform_attempt = fn node, ctx:
     err,
     blockStatement:: [
       expressionStatement::
+        # TODO: should return undef
         arrayExpression:: [err, nullLiteral()]
     ]
 

src/lang/conditionals/attempt.test.fnk

@@ -8,12 +8,12 @@ describe:: 'attempt', fn:
     expect::
       fink2js`
         foo1 = fn:
-          [item, err] = attempt:
+          [err, item] = attempt:
             bar = shrub()
             bar + ni()
           [item, err]
 
-        foo2 = fn: attempt: 1/0
+        foo2 = fn: attempt: throw new Error:: 'foobar'
       `
       to_match_snapshot
 

src/lang/conditionals/attempt.test.fnk.snap

@@ -11,13 +11,13 @@ exports[`attempt compiles 1`] = `
     _do_result = [ˆerror_1, null];
   }
 
-  const [item, err] = _do_result;
+  const [err, item] = _do_result;
   _do_result = undefined;
   return [item, err];
 };
 
 const foo2 = () => try {
-  return [null, 1 / 0];
+  return [null, throw new Error(\`foobar\`)];
 } catch (ˆerror_2) {
   return [ˆerror_2, null];
 };

src/lang/literals/array.fnk

@@ -6,7 +6,7 @@ transform_array = fn node, {transform}:
     map elem:
       match elem:
         null: null
+        {type: 'empty'}: null
         else: transform:: elem
 
   arrayExpression:: elems
-

src/lang/literals/object.fnk

@@ -1,9 +1,9 @@
 {objectExpression, objectProperty, stringLiteral, assignmentPattern} = import '@babel/types'
 
 
-transform_object = fn node, ctx:
+transform_object = fn node, {transform}:
   [...props] = pipe node.exprs:
-    map expr: ctx.transform:: expr
+    map prop: transform:: prop
 
   objectExpression:: props