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79 lines
1.6 KiB
Markdown
79 lines
1.6 KiB
Markdown
---
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id: 69162d64f96574d9bb629f02
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title: "Challenge 117: Symmetric Difference"
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challengeType: 29
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dashedName: challenge-117
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---
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# --description--
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Given two arrays, return a new array containing the symmetric difference of them.
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- The symmetric difference between two sets is the set of values that appear in either set, but not both.
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- Return the values in the order they first appear in the input arrays.
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# --hints--
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`difference([1, 2, 3], [3, 4, 5])` should return `[1, 2, 4, 5]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(difference([1, 2, 3], [3, 4, 5]), [1, 2, 4, 5])`)
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}})
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```
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`difference(["a", "b"], ["c", "b"])` should return `["a", "c"]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(difference(["a", "b"], ["c", "b"]), ["a", "c"])`)
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}})
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```
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`difference([1, "a", 2], [2, "b", "a"])` should return `[1, "b"]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(difference([1, "a", 2], [2, "b", "a"]), [1, "b"])`)
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}})
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```
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`difference([1, 3, 5, 7, 9], [1, 2, 3, 4, 5, 6, 7, 8, 9])` should return `[2, 4, 6, 8]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(difference([1, 3, 5, 7, 9], [1, 2, 3, 4, 5, 6, 7, 8, 9]), [2, 4, 6, 8])`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def difference(arr1, arr2):
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return arr1
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```
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# --solutions--
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```py
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def difference(arr1, arr2):
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diff = []
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for v in arr1:
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if v not in arr2 and v not in diff:
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diff.append(v)
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for v in arr2:
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if v not in arr1 and v not in diff:
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diff.append(v)
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return diff
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```
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