1 files changed, 30 insertions, 0 deletions
diff --git a/school/node_modules/graphql/jsutils/keyValMap.js b/school/node_modules/graphql/jsutils/keyValMap.js
new file mode 100644
index 0000000..0b2dab5
--- /dev/null
+++ b/school/node_modules/graphql/jsutils/keyValMap.js
@@ -0,0 +1,30 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = keyValMap;
+
+/**
+ * Creates a keyed JS object from an array, given a function to produce the keys
+ * and a function to produce the values from each item in the array.
+ *
+ *     const phoneBook = [
+ *       { name: 'Jon', num: '555-1234' },
+ *       { name: 'Jenny', num: '867-5309' }
+ *     ]
+ *
+ *     // { Jon: '555-1234', Jenny: '867-5309' }
+ *     const phonesByName = keyValMap(
+ *       phoneBook,
+ *       entry => entry.name,
+ *       entry => entry.num
+ *     )
+ *
+ */
+function keyValMap(list, keyFn, valFn) {
+  return list.reduce(function (map, item) {
+    map[keyFn(item)] = valFn(item);
+    return map;
+  }, Object.create(null));
+}