题解 | #计数#

计数

https://www.nowcoder.com/practice/628339bd8e6e440590ad86caa7ac6849

This solution might sound redundent, but I will improve it later, since it is developed by myself totally,the key logic will be like

find out all the index of item in a array, then push those index number into a array, after that, calculate the lengh of the array to get the number of repeatition time appear in a array.

Array.prototype.indexOf()

JavaScript Array length

Remove duplicate values from JS array [duplicate]

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