ui

app/code/node_modules/collect.js/src/methods/sum.js

@@ -0,0 +1,27 @@
+'use strict';
+
+const values = require('../helpers/values');
+const { isFunction } = require('../helpers/is');
+
+module.exports = function sum(key) {
+  const items = values(this.items);
+
+  let total = 0;
+
+  if (key === undefined) {
+    for (let i = 0, { length } = items; i < length; i += 1) {
+      total += parseFloat(items[i]);
+    }
+  } else if (isFunction(key)) {
+    for (let i = 0, { length } = items; i < length; i += 1) {
+      total += parseFloat(key(items[i]));
+    }
+  } else {
+    for (let i = 0, { length } = items; i < length; i += 1) {
+      total += parseFloat(items[i][key]);
+    }
+  }
+
+
+  return parseFloat(total.toPrecision(12));
+};