arrCount 
Returns the number of duplicates for each unique value in the given array. The array values can only be of type String or Number.
Parameters
array::string[]|number[]count::number
Returns
object
Examples
javascript
arrCount(['a', 'a', 'a', 'b', 'c', 'b', 'a', 'd']); // Returns { a: 4, b: 2, c: 1, d: 1 }dart
arrCount(['a', 'a', 'a', 'b', 'c', 'b', 'a', 'd']); // Returns { a: 4, b: 2, c: 1, d: 1 }