1 const numOfAppearances = (array, value) => { 2 return array.reduce((acc, currVal) => currVal === value ? ++acc : acc, 0); 3 }; 4 5 const count = numOfAppearances(['one', 'yes', 3, 'yes', false], 'yes'); // 2

1 array = [1, 1, 2, 2, 2, 3] 2 max(set(array), key=array.count) # 2