Created
February 21, 2019 16:59
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An example of using recursion to update a nested json file
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let myList = { | |
"type": "list", | |
"name": "Hello world", | |
"description": "nestednesss!", | |
"features": [ | |
{ | |
"clientId": "-ACEnpvvPe", | |
"type": "list", | |
"name": "🌈", | |
"description": "", | |
"features": [ | |
{ | |
"clientId": "IsfpEx4lwN", | |
"type": "list", | |
"name": "❤️1", | |
"description": "A list 1 description", | |
"features": [ | |
{ | |
"url": "www.itp.nyu.edu", | |
"name": "✨1", | |
"description": "Website to NYU's ITP/IMA program" | |
}, | |
{ | |
"url": "www.nautilist.github.io/", | |
"name": "✨2", | |
"description": "Nautilist is a tool for ..." | |
} | |
] | |
}, | |
{ | |
"clientId": "XJx3F-a1g7", | |
"type": "list", | |
"name": "❤️2", | |
"description": "A list 2 description", | |
"features": [ | |
{ | |
"url": "www.itp.nyu.edu", | |
"name": "🌴1", | |
"description": "Website to NYU's ITP/IMA program" | |
}, | |
{ | |
"url": "www.nautilist.github.io/", | |
"name": "🌴2", | |
"description": "Nautilist is a tool for ..." | |
} | |
] | |
} | |
] | |
} | |
], | |
"clientId": "rT-b5USQ1k" | |
} | |
// console.log(myList); | |
let updatedList = findRecursive(myList, 'IsfpEx4lwN'); | |
moveVal(updatedList.features, 1, 0); | |
updateMain(myList, updatedList, 'IsfpEx4lwN') | |
console.log( JSON.stringify(myList) ) | |
// helper functions | |
function moveVal(arr, from, to) { | |
arr.splice(to, 0, arr.splice(from, 1)[0]); | |
}; | |
function updateMain(_myList, _updatedList, _parentId){ | |
// update the data directly here! | |
if(_myList.clientId === _parentId){ | |
_myList = _updatedList | |
return updatedList | |
} | |
let p; | |
for(p in _myList){ | |
if(_myList.hasOwnProperty(p) && typeof _myList[p] === 'object'){ | |
_myList = updateMain(_myList[p], _updatedList, _parentId); | |
if(_myList){ | |
return _myList | |
} | |
} | |
} | |
return _myList | |
} | |
function findRecursive(_myList, _parentId){ | |
const listCopy = Object.assign({}, _myList); | |
let result; | |
let p; | |
// early return | |
if(listCopy.clientId === _parentId){ | |
return listCopy; | |
} | |
for(p in listCopy){ | |
if(listCopy.hasOwnProperty(p) && typeof listCopy[p] === 'object'){ | |
result = findRecursive(listCopy[p], _parentId); | |
if(result){ | |
return result; | |
} | |
} | |
} | |
return result | |
} | |
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