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Second-Cheapest Book

Allowed Time: 40 mins

Given an array of book objects, return the book object with the second-cheapest price. eg.

secondCheapest([
    {title:'Fox In Socks', price:32.20},
    {title:'The Cat In The Hat', price:16.20},
    {title:'Green Eggs and Ham', price:28.50},
    {title:'Thinking Fast and Slow', price:58.80}
]);

should return the third object in the input list.

Note:

  • If the array is empty, return undefined
  • If there is only one item in the array, return that item
  • All books will have a different price
  • Do not sort the list
  • The return value must point to an object in the original list, not a copy of that object
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