To sort an array by an object key using only the `sort_by` …

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To sort an array by an object key using only the `sort_by` method, you can pass the `reverse` option parameter. For example:
array = [{name:"John", age:34}, {name:"Sarah", age:31}, {name:"Bob", age:27}]
sorted_array = array.sort_by{|obj| obj[:age]}, reverse: true #=> [{name:"John", age:34}, {name:"Sarah", age:31}, {name:"Bob", age:27}]