Examples

const members = [[45, 12],[55,21],[19, -2],[104, 20]];

const openOrSenior = (data) => data.map((member) => member[0] >= 55 && member[1] > 7 ? 'Senior' : 'Open');

destuctured

const openOrSenior = (data) => data.map(([age, handicap]) => age >= 55 && handicap > 7 ? 'Senior' : 'Open');

openOrSenior(members); // [ 'Open', 'Senior', 'Open', 'Senior' ]