From fbb994f1b2af09b60d325739c32eb1d05a3a179d Mon Sep 17 00:00:00 2001
From: Yvie Raij <gunghogirl@gmail.com>
Date: Sat, 15 Jul 2017 17:07:25 -0700
Subject: [PATCH] Add files via upload

missing flatten method
---
 arrays.js | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 arrays.js

diff --git a/arrays.js b/arrays.js
new file mode 100644
index 0000000..231015e
--- /dev/null
+++ b/arrays.js
@@ -0,0 +1,77 @@
+// Complete the following functions.
+// These functions only need to work with arrays.
+
+
+const each = (elements, cb) => {
+  // Iterates over a list of elements, yielding each in turn to the `cb` function.
+  // This only needs to work with arrays.
+  // based off http://underscorejs.org/#each
+  for (let i = 0; i < elements.length; i++) {
+    cb(elements[i], i);
+  }
+};
+
+const map = (elements, cb) => {
+  // Produces a new array of values by mapping each value in list through a transformation function (iteratee).
+  // Return the new array.
+  // it(['should return an array'], () => {
+  //     const arr = [];
+  //     const result = arrayMethods.map(arr, n => (n * n));
+  //     expect(Array.isArray(result)).toBe(true);
+  //   });
+  const arr = [];
+  for (let i = 0; i < elements.length; i++) {
+    arr.push(cb(elements[i]));
+  }
+  return arr;
+};
+
+const reduce = (elements, cb, memo = elements.shift()) => {
+  // Combine all elements into a single value going from left to right.
+  // Elements will be passed one by one into `cb`.
+  // `memo` is the starting value.  If `memo` is undefined then make `elements[0]` the initial value.
+  for (let i = 0; i < elements.length; i++) {
+    memo = cb(memo, elements[i]);
+  }
+  return memo;
+};
+
+const find = (elements, cb) => {
+  // Look through each value in `elements` and pass each element to `cb`.
+  // If `cb` returns `true` then return that element.
+  // Return `undefined` if no elements pass the truth test.
+  for (let i = 0; i < elements.length; i++) {
+    if (cb(elements[i]) === true) return elements[i];
+  }
+  return undefined;
+};
+
+const filter = (elements, cb) => {
+  // Similar to `find` but you will return an array of all elements that passed the truth test
+  // Return an empty array if no elements pass the truth test
+  const newArray = [];
+  elements.forEach((element) => {
+    if (cb(element)) newArray.push(element);
+  });
+  return newArray;
+};
+
+const flatten = (elements) => {
+  // Flattens a nested array (the nesting can be to any depth).
+  // Example: flatten([1, [2], [3, [[4]]]]); => [1, 2, 3, 4];
+  // Array.isArray(obj) ? ele
+};
+// const newArray = [];
+// elements.forEach() Array.isArray(results)
+// return newArray = [];
+
+/* eslint-enable no-unused-vars, max-len */
+
+module.exports = {
+  each,
+  map,
+  reduce,
+  find,
+  filter,
+  flatten
+};