Update docs

scripts/helpers.js

@@ -0,0 +1,37 @@
+function chunk(array, size = 1) {
+  return Array.range(Math.ceil(array.length / size)).map(i => array.slice(i * size, i * size + size));
+}
+
+function range(start, stop = undefined, step = 1) {
+  if (!stop) {
+    stop = start;
+    start = 0;
+  }
+  return start < stop
+    ? Array(Math.ceil((stop - start) / step))
+        .fill()
+        .map((_, i) => start + i * step)
+    : [];
+}
+
+function unique(array, op = x => x) {
+  return array.filter((obj, i) => array.findIndex(entry => op(obj) === op(entry)) === i);
+}
+
+function zip(...args) {
+  return Array(Math.max(...args.map(arg => arg.length)))
+    .fill(null)
+    .map((_, i) => args.map(arg => arg[i]));
+}
+
+function capitalize(str) {
+  return str.charAt(0).toUpperCase() + str.slice(1);
+}
+
+module.exports = {
+  chunk,
+  range,
+  unique,
+  zip,
+  capitalize,
+};