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function sequence(newStart, newStep) {
    var currentCount = newStart || 0;
    var step = newStep || 1;
    
    return function() {
        currentCount += step;
        return currentCount;
    };
}
function fmap(gen, action) {
    return function() {
        return action(gen());
    };
}
var gen = sequence(1, 1);
function square(x) { return x * x; }
var squareGen = fmap(gen, square);
console.log(squareGen()); // 1
console.log(squareGen()); // 4
console.log(squareGen()); // 9
console.log(squareGen()); // 16
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