docs(challenge): Add instruction to symdiff challenge
Add instructions about the expected return value.pull/10505/head
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"title": "Symmetric Difference",
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"description": [
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"Create a function that takes two or more arrays and returns an array of the <dfn>symmetric difference</dfn> (<code>△</code> or <code>⊕</code>) of the provided arrays.",
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"Given two sets (for example set <code>A = {1, 2, 3}</code> and set <code>B = {2, 3, 4}</code>), the mathematical term \"symmetric difference\" of two sets is the set of elements which are in either of the two sets, but not in both (<code>A △ B = C = {1, 4}</code>). For every additional symmetric difference you take (say on a set <code>D = {2, 3}</code>), you should get the set with elements which are in either of the two the sets but not both (<code>C △ D = {1, 4} △ {2, 3} = {1, 2, 3, 4}</code>).",
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"Given two sets (for example set <code>A = {1, 2, 3}</code> and set <code>B = {2, 3, 4}</code>), the mathematical term \"symmetric difference\" of two sets is the set of elements which are in either of the two sets, but not in both (<code>A △ B = C = {1, 4}</code>). For every additional symmetric difference you take (say on a set <code>D = {2, 3}</code>), you should get the set with elements which are in either of the two the sets but not both (<code>C △ D = {1, 4} △ {2, 3} = {1, 2, 3, 4}</code>). The resulting array must contain only unique values (<em>no duplicates</em>).",
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"Remember to use <a href='http://forum.freecodecamp.com/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck. Try to pair program. Write your own code."
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],
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"challengeSeed": [
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