Edit in JSFiddle

function coins(amount) {
    return [25, 10, 5, 1].map(function (coin) {
        return [~~ (amount / coin), amount %= coin][0];
    });
}

function coins2(amount) {
    var res = {};
    [25, 10, 5, 1].map(function (coin) {
        res[coin] = Math.floor(amount / coin);
        amount = amount % coin;
    });
    return res;
}


var result1 = coins(118);
console.log(result1);

var result2 = coins2(118);
console.log(result2);