From 1455b384058184796279c629c21a754cd8fb4482 Mon Sep 17 00:00:00 2001
From: "(quasar) nebula" <qznebula@protonmail.com>
Date: Tue, 19 Jul 2022 12:43:09 -0300
Subject: finish porting listing specs (!!)

---
 src/util/sugar.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src/util/sugar.js')

diff --git a/src/util/sugar.js b/src/util/sugar.js
index 2883d949..754f1991 100644
--- a/src/util/sugar.js
+++ b/src/util/sugar.js
@@ -30,6 +30,20 @@ export function* splitArray(array, fn) {
   }
 }
 
+// Sums the values in an array, optionally taking a function which maps each
+// item to a number (handy for accessing a certain property on an array of like
+// objects). This also coalesces null values to zero, so if the mapping function
+// returns null (or values in the array are nullish), they'll just be skipped in
+// the sum.
+export function accumulateSum(array, fn = x => x) {
+  return array.reduce(
+    (accumulator, value, index, array) =>
+      accumulator +
+        fn(value, index, array) ?? 0,
+    0
+  );
+}
+
 export const mapInPlace = (array, fn) =>
   array.splice(0, array.length, ...array.map(fn));
 
-- 
cgit 1.3.0-6-gf8a5