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Update reverse string challenge (#113)

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Update input check logic to check for an empty but not None entry.
This commit is contained in:
Donne Martin
2016-11-06 08:38:08 -05:00
committed by GitHub
parent aa4c8ae5b4
commit c6677586d3
1 changed files with 6 additions and 6 deletions
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12
arrays_strings/reverse_string/reverse_string_solution.ipynb
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@@ -97,8 +97,8 @@
"class ReverseString(object):\n", "class ReverseString(object):\n",
"\n", "\n",
" def reverse(self, chars):\n", " def reverse(self, chars):\n",
" if chars is None:\n", " if chars is None or not chars:\n",
" return None\n", " return chars\n",
" size = len(chars)\n", " size = len(chars)\n",
" for i in range(size//2):\n", " for i in range(size//2):\n",
" chars[i], chars[size-1-i] = \\\n", " chars[i], chars[size-1-i] = \\\n",
@@ -126,13 +126,13 @@
"class ReverseStringAlt(object):\n", "class ReverseStringAlt(object):\n",
"\n", "\n",
" def reverse_string_alt(string):\n", " def reverse_string_alt(string):\n",
" if string is None:\n", " if string is None or not string:\n",
" return None\n", " return string\n",
" return string[::-1]\n", " return string[::-1]\n",
"\n", "\n",
" def reverse_string_alt2(string):\n", " def reverse_string_alt2(string):\n",
" if string is None:\n", " if string is None or not string:\n",
" return None\n", " return string\n",
" return ''.join(reversed(string))" " return ''.join(reversed(string))"
] ]
}, },