update the symmetric difference challenge
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		| @@ -605,21 +605,6 @@ | ||||
|       "expect(pairwise([], 100)).to.equal(0);" | ||||
|     ] | ||||
|   }, | ||||
|   { | ||||
|     "_id": "a3f503de51cf954ede28891d", | ||||
|     "name": "Symmetric Difference", | ||||
|     "difficulty": "2.20", | ||||
|     "description": [ | ||||
|       "Create a function that takes two or more arrays and returns an array of the symmetric difference of the provided arrays.", | ||||
|       "The mathematical term symmetric difference refers to the elements in two sets that are in either the first or second set, but not in both." | ||||
|     ], | ||||
|     "challengeSeed": "function sym(arr) {\n  return arr;\r\n}\n\nsym([1, 2, 3], [5, 2, 1, 4]);", | ||||
|     "tests": [ | ||||
|       "assert.deepEqual(sym([1, 2, 5], [2, 3, 5], [3, 4, 5]), [1, 4, 5], 'should return the symmetric difference of the given arrays');", | ||||
|       "assert.deepEqual(sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]), [1, 4, 5], 'should return an array of unique values');", | ||||
|       "assert.deepEqual(sym([1, 1]), [1], 'should return an array of unique values');" | ||||
|     ] | ||||
|   }, | ||||
|   { | ||||
|     "_id": "a10d2431ad0c6a099a4b8b52", | ||||
|     "name": "Everything Be True", | ||||
| @@ -735,10 +720,25 @@ | ||||
|     ], | ||||
|     "challengeSeed": "function telephoneCheck(str) {\n  // Good luck!\n  return true;\n}\n\n\n\ntelephoneCheck(\"555-555-5555\");" | ||||
|   }, | ||||
|   { | ||||
|     "_id": "a3f503de51cf954ede28891d", | ||||
|     "name": "Symmetric Difference", | ||||
|     "difficulty": "4.02", | ||||
|     "description": [ | ||||
|       "Create a function that takes two or more arrays and returns an array of the symmetric difference of the provided arrays.", | ||||
|       "The mathematical term symmetric difference refers to the elements in two sets that are in either the first or second set, but not in both." | ||||
|     ], | ||||
|     "challengeSeed": "function sym(args) {\n  return arr;\r\n}\n\nsym([1, 2, 3], [5, 2, 1, 4]);", | ||||
|     "tests": [ | ||||
|       "assert.deepEqual(sym([1, 2, 5], [2, 3, 5], [3, 4, 5]), [1, 4, 5], 'should return the symmetric difference of the given arrays');", | ||||
|       "assert.deepEqual(sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]), [1, 4, 5], 'should return an array of unique values');", | ||||
|       "assert.deepEqual(sym([1, 1]), [1], 'should return an array of unique values');" | ||||
|     ] | ||||
|   }, | ||||
|   { | ||||
|     "_id": "aa2e6f85cab2ab736c9a9b24", | ||||
|     "name": "Cash Register", | ||||
|     "difficulty": "4.02", | ||||
|     "difficulty": "4.03", | ||||
|     "description": [ | ||||
|       "Design a cash register drawer function that accepts purchase price as the first argument, payment as the second argument, and cash-in-drawer (cid) as the third argument.", "cid is a 2d array listing available currency.", "Return the string \"Insufficient Funds\" if cash-in-drawer is less than the change due. Return the string \"Closed\" if cash-in-drawer is equal to the change due.", "Otherwise, return change in coin and bills, sorted in highest to lowest order." | ||||
|     ], | ||||
| @@ -756,7 +756,7 @@ | ||||
|   { | ||||
|     "_id": "a56138aff60341a09ed6c480", | ||||
|     "name": "Inventory Update", | ||||
|     "difficulty": "4.03", | ||||
|     "difficulty": "4.04", | ||||
|     "description": [ | ||||
|       "Compare and update inventory stored in a 2d array against a second 2d array of a fresh delivery. Update current inventory item quantity, and if an item cannot be found, add the new item and quantity into the inventory array in alphabetical order." | ||||
|     ], | ||||
| @@ -773,7 +773,7 @@ | ||||
|   { | ||||
|     "_id": "a7bf700cd123b9a54eef01d5", | ||||
|     "name": "No repeats please", | ||||
|     "difficulty": "4.04", | ||||
|     "difficulty": "4.05", | ||||
|     "description": [ | ||||
|       "Return the number of total permutations of the provided string that don't have repeated consecutive letters.", | ||||
|       "For example, 'aab' should return 2 because it has 6 total permutations, but only 2 of them don't have the same letter (in this case 'a') repeating." | ||||
| @@ -792,7 +792,7 @@ | ||||
|   { | ||||
|     "_id": "a19f0fbe1872186acd434d5a", | ||||
|     "name": "Friendly Date Ranges", | ||||
|     "difficulty": "4.05", | ||||
|     "difficulty": "4.06", | ||||
|     "description": [ | ||||
|       "Implement a way of converting two dates into a more friendly date range that could be presented to a user.", | ||||
|       "It must not show any redundant information in the date range.", | ||||
|   | ||||
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