packages/contract-wrappers/src/utils/market_orders_optimization_utils.ts


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import { SignedOrder } from '@0xproject/types';
import * as _ from 'lodash';

import { constants } from './constants';

export const marketOrdersOptimizationUtils = {
    /**
     * Takes an array of orders and outputs an array of equivalent orders where all takerAssetData are '0x' and
     * all makerAssetData are '0x' except for that of the first order, which retains its original value
     * @param   orders         An array of SignedOrder objects
     * @returns optimized orders
     */
    optimizeMarketOrders(orders: SignedOrder[]): SignedOrder[] {
        const optimizedOrders = _.map(orders, (order, index) => {
            const makerAssetData = index === 0 ? order.makerAssetData : constants.NULL_BYTES;
            const takerAssetData = constants.NULL_BYTES;
            return {
                ...order,
                makerAssetData,
                takerAssetData,
            };
        });
        return optimizedOrders;
    },
    /**
     * Takes an array of orders and outputs an array of equivalent orders where all takerAssetData are '0x' and
     * all makerAssetData are '0x'
     * @param   orders         An array of SignedOrder objects
     * @returns optimized orders
     */
    optimizeFeeOrders(orders: SignedOrder[]): SignedOrder[] {
        const optimizedOrders = _.map(orders, order => {
            const makerAssetData = constants.NULL_BYTES;
            const takerAssetData = constants.NULL_BYTES;
            return {
                ...order,
                makerAssetData,
                takerAssetData,
            };
        });
        return optimizedOrders;
    },
};