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I dropped some lines in Typescript.
Solution based on filter() and indexOf. indexOf returns the index of the first occurrence of the item in the array. So if a character appears the second time in the string, indexOf and index will be different.
I dropped some lines in Typescript.
Solution based on filter() and indexOf. indexOf returns the index of the first occurrence of the item in the array. So if a character appears the second time in the string, indexOf and index will be different.