Volevo un giudizio su 2 versioni a confronto per aiutarmi a scegliere la migliore  Versione A var BookStateManager = (function() {
    var cachedBookState = null;
    return {
        getBookState: function(book) {
            var newState = this.createBookState(book);
            var stateChanged = cachedBookState ? this.hasBookStateChanged(newState) : true;
            if (stateChanged) {
                cachedBookState = newState;
                StateManager.updateLastValues(newState);
            }
            return cachedBookState;
        },
        hasBookStateChanged: function(newState) {
            return this.isSideChanged('BID', newState) || this.isSideChanged('ASK', newState);
        },
isTypeChanged: function(cachedArray, newArray, maxLevel) {
    return this.compareArrays(cachedArray, newArray, maxLevel);
},

isSideChanged: function(side, newState) {
    var maxLevel = CONFIG.LEVELS[side];
    var cachedSide = cachedBookState.book[side];
    var newSide = newState.book[side];
    return this.isTypeChanged(cachedSide.Prices, newSide.Prices, maxLevel) || 
           this.isTypeChanged(cachedSide.Quantities, newSide.Quantities, maxLevel);
},
        compareArrays: function(arr1, arr2, max) {
            return arr1.slice(0, max).join(',') !== arr2.slice(0, max).join(',');
        },
createBookState: function(book) {
    function createSideData(side) {
        var levels = CONFIG.LEVELS[side];
        return {
            Prices: this.getData(book, side, levels, 'Price'),
            Quantities: this.getData(book, side, levels, 'Quantity')
        };
    }

    return {
        book: book,
        BID: createSideData.call(this, 'BID'),
        ASK: createSideData.call(this, 'ASK')
    };
},
        getData: function(book, side, level, type) {
            return book && book[side] && book[side][type + 's'] ? book[side][type + 's'][level] : undefined;
        }
    };
})();    VERSIONE B ALTERNATIVA var BookStateManager = (function() {
    var cachedBookState = null;
    var cachedBookData = { BID: null, ASK: null }; // Cache per i dati del book

    function createSideData(book, side, levels) {
        if (!cachedBookData[side] || cachedBookData[side].book !== book) {
              cachedBookData[side] = {
                book: book,
                P: getData(book, side, levels, 'Price'),
                Q: getData(book, side, levels, 'Quantity')
              };
        }
        return cachedBookData[side];
    }

    function getData(book, side, level, type) {
        return book && book[side] && book[side][type + 's'] ? book[side][type + 's'][level] : undefined;
    }

    function compareArrays(arr1, arr2, max) {
        for (var i = 0; i < max; i++) {
            if (arr1[i] !== arr2[i]) {
                return true; // Gli array sono diversi
            }
        }
        return false; // Gli array sono uguali
    }

    function isTypeChanged(cachedArray, newArray, maxLevel) {
        return compareArrays(cachedArray, newArray, maxLevel);
    }

    function isSideChanged(side, newState, cachedState) {
        var maxLevel = CONFIG.LEVELS[side];
        var cachedSide = cachedState[side];
        var newSide = newState[side];
        return isTypeChanged(cachedSide.P, newSide.P, maxLevel) ||
               isTypeChanged(cachedSide.Q, newSide.Q, maxLevel);
    }

    function hasBookStateChanged(newState, cachedState) {
        return isSideChanged('BID', newState, cachedState) || isSideChanged('ASK', newState, cachedState);
    }

    function getBookState(book) {
        var newState = {
          BID: createSideData(book, 'BID', CONFIG.LEVELS.BID),
          ASK: createSideData(book, 'ASK', CONFIG.LEVELS.ASK)
        };

        var stateChanged = cachedBookState ? hasBookStateChanged(newState, cachedBookState) : true;
        if (stateChanged) {
            cachedBookState = newState;
            stateManager.updateLastValues({
              bidPrice: newState.BID.P[0],
              bidQuantity: newState.BID.Q[0],
              askPrice: newState.ASK.P[0],
              askQuantity: newState.ASK.Q[0]
            });
        }
        return cachedBookState;
    }

    return {
        getBookState: getBookState,
        hasBookStateChanged: hasBookStateChanged,
        isTypeChanged: isTypeChanged,
        isSideChanged: isSideChanged,
        compareArrays: compareArrays,
        createSideData: createSideData,
        getData: getData
    };
})();