The Reduce Array Method Example 5

reduce-array-method-example-5.js

/**
 * Reducing Properties
 * Use the 'reduce' helper to create an object that tallies the number of sitting and standing desks.  
 * The object returned should have the form '{ sitting: 3, standing: 2 }'.  
 * The initial value has been provided to you.
 * Hint: Don't forget to return the accumulator object (the first argument to the iterator function)
 */

var desks = [
  { type: 'sitting' },
  { type: 'standing' },
  { type: 'sitting' },
  { type: 'sitting' },
  { type: 'standing' }
];

var deskTypes = desks.reduce((total, desk) => {
    total.sitting += desk.type === 'sitting';
    total.standing += desk.type === 'standing';
    return total;
}, { sitting: 0, standing: 0 });

console.log(deskTypes);
/**
 * Result is
 * [object Object] {
 *   sitting: 3,
 *   standing: 2
 * }
 */