javascriptConvert Array to new A

javascript - Convert Array to new Array (counting occurrences) - Stack Overflow
I have an array of n number of itemsvar arr1 = [2, 0, 0, 1, 1, 2, 0, 0, 0, 2, 1, 1, 0, 1, 0, 1, 0, 0, 1
javascriptConvert Array to new Array (counting occurrences)Stack Overflow
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