Array deduplication in JavaScript and Python

"Array deduplication" is a commonly used operation in practical applications, and the probability of appearing in interview questions is also very high. Today I will briefly describe the method of array deduplication in Python and JavaScript. I hope it can help everyone.

Python array deduplication

>>> a = [9,8,7,9,7,1,2,1,2,5,3] >>> new_a = list(set(a)) >>> new_a [1, 2, 3, 5, 7, 8, 9] #此时new_a未保持原有的顺序，对new_a进行排序 >>> new_a.sort(key = a.index) >>> new_a [9, 8, 7, 1, 2, 5, 3]

JavaScript array deduplication

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