transformers-converters.js

/**
 * Get cultures name into a new array
 * Immutable, pure
 * @param {Array} cultures
 * @returns {Array<String>}
 */
const getNames = cultures => cultures.map(item => item.cultureName);

/**
 * Get cultures quantity summed into
 * a new Object separeted by unit
 * @param {Array} cultures 
 * @returns {Object}
 */
const energies = cultures => cultures
  .reduce((acc, nextObject) => {
    const nextValue = nextObject.energy.quantity;
    const currentValue = acc[nextObject.energy.unit] 
      ? acc[nextObject.energy.unit].quantity 
      : 0;
    acc[nextObject.energy.unit] = {
      quantity: currentValue + nextValue,
    };
    return acc;
  }, {});

/**
 * Get cultures quantity summed if it has
 * some value, otherwhise it is not summed
 * preventing NaN
 * @param {Array} cultures 
 * @returns {Number}
 */
const totalQuantity = cultures => cultures
  .filter(item => !item.quantity)
  .reduce((acc, nextObject) => acc + nextObject['quantity'], 0);