making a shoebox

1 files changed, 34 insertions, 0 deletions

diff --git a/src/app/utils/data_utils.js b/src/app/utils/data_utils.js
new file mode 100644
index 0000000..327e594
--- /dev/null
+++ b/src/app/utils/data_utils.js
@@ -0,0 +1,34 @@
+/**
+ * Data manipulation utilities.
+ * @module app/utils/data_utils
+ */
+
+/**
+ * Convert an enum to a lookup
+ * @param  {Object}  dictionary: number -> string
+ * @return {Object}  dictionary: string -> number
+ */
+export const enumLookup = (dict) =>
+  Object.entries(dict).reduce((lookup, pair) => {
+    lookup[pair[1]] = parseInt(pair[0]);
+    return lookup;
+  }, {});
+
+/**
+ * Divide an array into N-item chunks
+ * @param  {Array}        arr   array to be chunked
+ * @param  {number}       size  items per chunk
+ * @return {Array} array of array chunks
+ */
+export const chunk = (arr, size) =>
+  arr.length > size
+    ? [arr.slice(0, size), ...chunk(arr.slice(size), size)]
+    : [arr];
+
+/**
+ * Delay during async operation
+ * @param  {number}  delay time to delay
+ * @return {Promise}       promise that resolves after a delay
+ */
+export const delay = (delay = 1) =>
+  new Promise((resolve) => setTimeout(resolve, delay));