data: factor out performAvailabilityCheck

2 files changed, 25 insertions, 25 deletions

diff --git a/src/data/composite/control-flow/helpers/performAvailabilityCheck.js b/src/data/composite/control-flow/helpers/performAvailabilityCheck.js
new file mode 100644
index 00000000..0e44ab59
--- /dev/null
+++ b/src/data/composite/control-flow/helpers/performAvailabilityCheck.js
@@ -0,0 +1,19 @@
+import {empty} from '#sugar';
+
+export default function performAvailabilityCheck(value, mode) {
+  switch (mode) {
+    case 'null':
+      return value !== undefined && value !== null;
+
+    case 'empty':
+      return value !== undefined && !empty(value);
+
+    case 'falsy':
+      return !!value && (!Array.isArray(value) || !empty(value));
+
+    case 'index':
+      return typeof value === 'number' && value >= 0;
+  }
+
+  return undefined;
+}
diff --git a/src/data/composite/control-flow/withResultOfAvailabilityCheck.js b/src/data/composite/control-flow/withResultOfAvailabilityCheck.js
index 1d90b324..c2f64d21 100644
--- a/src/data/composite/control-flow/withResultOfAvailabilityCheck.js
+++ b/src/data/composite/control-flow/withResultOfAvailabilityCheck.js
@@ -23,10 +23,11 @@
 //
 
 import {input, templateCompositeFrom} from '#composite';
-import {empty} from '#sugar';
 
 import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js';
 
+import performAvailabilityCheck from './helpers/performAvailabilityCheck.js';
+
 export default templateCompositeFrom({
   annotation: `withResultOfAvailabilityCheck`,
 
@@ -40,33 +41,13 @@ export default templateCompositeFrom({
   steps: () => [
     {
       dependencies: [input('from'), input('mode')],
-
       compute: (continuation, {
         [input('from')]: value,
         [input('mode')]: mode,
-      }) => {
-        let availability;
-
-        switch (mode) {
-          case 'null':
-            availability = value !== undefined && value !== null;
-            break;
-
-          case 'empty':
-            availability = value !== undefined && !empty(value);
-            break;
-
-          case 'falsy':
-            availability = !!value && (!Array.isArray(value) || !empty(value));
-            break;
-
-          case 'index':
-            availability = typeof value === 'number' && value >= 0;
-            break;
-        }
-
-        return continuation({'#availability': availability});
-      },
+      }) => continuation({
+        ['#availability']:
+          performAvailabilityCheck(value, mode),
+      }),
     },
   ],
 });