Python, 45 bytes

lambda x:x and min(x,key=len)==max(x,key=len)

#Python, 45 bytes

lambda x:x and min(x,key=len)==max(x,key=len)

lambda x:x and min(x,key=len)==max(x,key=len)

added 6 characters in body

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edited Jun 9, 2016 at 21:59

#Python, 4245 bytes

lambda x:all(lenx and min(ex,key=len)==len==max(x[0])for e in x,key=len)

#Python, 42 bytes

lambda x:all(len(e)==len(x[0])for e in x)

#Python, 45 bytes

lambda x:x and min(x,key=len)==max(x,key=len)

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created Jun 9, 2016 at 21:32

#Python, 42 bytes

lambda x:all(len(e)==len(x[0])for e in x)

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