diff --git a/lib/make/arrays.js b/lib/make/arrays.js
index 639461e..0d05fb6 100644
--- a/lib/make/arrays.js
+++ b/lib/make/arrays.js
@@ -6,13 +6,18 @@ const make = require('../make')
 const random = require('../random')
 
 class arrays extends make {
-  static filledArray (fn, limit) {
-    let array = []
-    let size = limit || random.number(make.number.tiny()) + 1
+  /**
+   * Returns an array containing random values generated by the supplied function
+   * @param {Function} fn - Function used to generate values
+   * @param {number} limit - Length of the array
+   * @returns {Array}
+   */
+  static filledArray (fn, limit = make.number.tiny()) {
+    const array = []
 
-    for (let i = 0; i < size; i++) {
-      let value = random.pick(fn)
-      if (value !== undefined) {
+    for (let i = 0; i < limit; i++) {
+      const value = random.pick(fn)
+      if (value !== null) {
         array.push(value)
       }
     }