Move getSymmetricDifference to helper file

helpers/array.js

@@ -0,0 +1,21 @@
+export function getSymmetricDifference (a, b) {
+    return [
+        a.filter(x => !b.includes(x)),
+        b.filter(x => !a.includes(x))
+    ]
+}
+
+export function logArraysDifference (a, b) {
+    const [ aOnly, bOnly ] = getSymmetricDifference(a, b)
+
+
+    console.log( 'Missing from first list:', aOnly )
+    console.log( 'Missing from second list:', bOnly )
+
+    console.log( `List difference Count ${ aOnly.length } / ${ bOnly.length }`,  )
+
+    return {
+        aOnly,
+        bOnly,
+    }
+}