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POConvert flat array of objects into nested array of objects
 

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    <p>Original JSON data (flat table):</p> <pre><code>[ {"id":"1","first_name":"Jason","last_name":"Martin","start_date":"1996-07-25","end_date":"2006-07-25","salary":"1234.56","city":"Toronto","description":"Programmer","department":"Finance","active":"1"}, {"id":"2","first_name":"Alison","last_name":"Mathews","start_date":"1976-03-21","end_date":"1986-02-21","salary":"6661.78","city":"Vancouver","description":"Tester","department":"Finance","active":"1"}, {"id":"3","first_name":"James","last_name":"Smith","start_date":"1978-12-12","end_date":"1990-03-15","salary":"6544.78","city":"Vancouver","description":"Tester","department":"QA","active":"1"}, {"id":"4","first_name":"Celia","last_name":"Rice","start_date":"1982-10-24","end_date":"1999-04-21","salary":"2344.78","city":"Vancouver","description":"Manager","department":"HR","active":"1"}, {"id":"5","first_name":"Robert","last_name":"Black","start_date":"1984-01-15","end_date":"1998-08-08","salary":"2334.78","city":"Vancouver","description":"Tester","department":"IT","active":"1"}, {"id":"6","first_name":"Linda","last_name":"Green","start_date":"1987-07-30","end_date":"1996-01-04","salary":"4322.78","city":"New York","description":"Tester","department":"QA","active":"1"}, {"id":"7","first_name":"David","last_name":"Larry","start_date":"1990-12-31","end_date":"1998-02-12","salary":"7897.78","city":"New York","description":"Manager","department":"HR","active":"1"} ] </code></pre> <p>I need to call the function like this:</p> <pre><code>nest(data,["city","description","department"]) </code></pre> <p>The first parameter is the entire dataset, the second is an array of columns which define the nesting level.</p> <p>Expected JSON output:</p> <pre><code>[ {key: "city", value: "Toronto", count: 1, children: [ {key: "description", value: "Programmer", count: 1, children: [ {key: "department", value: "Finance", count: 1} ] } ] }, {key: "city", value: "Vancouver", count: 2, children: [ {key: "description", value: "Tester", count: 3, children: [ {key: "department", value: "Finance", count: 1}, {key: "department", value: "QA", count: 1}, {key: "department", value: "IT", count: 1} ] }, {key: "description", value: "Manager", count: 1} ] }, {key: "city", value: "New York", count: 2, children: [ {key: "description", value: "Tester", count: 1, children: [ {key: "department", value: "QA", count: 1} ] }, {key: "description", value: "Manager", count: 1, children: [ {key: "department", value: "HR", count: 1} ] } ] } </code></pre> <p>]</p> <p>I've tried writing a few recursive functions but keep getting stuck when I have to dynamically search the tree to avoid duplication.</p>
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    1. COWhy `{key: "department", value: "Finance", count: 1}` instead of `{key: "department", value: "Finance", count: 0}`? That node has no children.
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    2. COWelcome to [SO]; please read the [faq].
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    3. COWhat is count? It is 1 even when children is zero?
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