You should define a method that takes an input and produces the output.
[
{ input: "8809", output: 6 },
{ input: "7111", output: 0 },
{ input: "2172", output: 0 },
{ input: "6666", output: 4 },
{ input: "1111", output: 0 },
{ input: "3213", output: 0 },
{ input: "7662", output: 2 },
{ input: "9313", output: 1 },
{ input: "0000", output: 4 },
{ input: "2222", output: 0 },
{ input: "3333", output: 0 },
{ input: "5555", output: 0 },
{ input: "8193", output: 3 },
{ input: "8096", output: 5 },
{ input: "7777", output: 0 },
{ input: "9999", output: 4 },
{ input: "7756", output: 1 },
{ input: "6855", output: 3 },
{ input: "9881", output: 5 },
{ input: "5531", output: 0 }
]