Node.js split JSON Object Per a Value

Question

I have a Node 10+ script that needs to split a JSON object. I have looked for various solutions but none fits my particular needs. Here is my object:

[ 
[ 
  {agent_id: '123',   start: '10-05-2018'},
  { agent_id: '123', start: '10-05-2018'} 
],
[ 
  { agent_id: '456', start: '10-04-2018'},
  { agent_id: '456', start: '10-05-2018'} 
] 
]

So there are two elements/nodes; one has agent_id of '123' and the other has '456'. But what needs to happen is if the start is the same in an element then no need to split, as in the case of agent_id of '123'. But in the case of start being different than that needs to split. So the end result in the case of the above object should be something like below. As you can see, there are three elements to the result. I have a look into 'map' or 'set' or other examples but none apply in my case. And hence I am here.

Thank you!

 [
    [
     { agent_id: '123',   start: '10-05-2018'},
     { agent_id: '123', start: '10-05-2018'}
    ],
    [ { agent_id: '456', start: '10-04-2018'}],
    [ { agent_id: '456', start: '10-05-2018'}]
    ]

kavigun · Accepted Answer · 2020-09-22 20:37:32Z

2

If you are not using lodash, you can try the following code in vanilla JS:

let input = [
    [
        { agent_id: '123', start: '10-05-2018' },
        { agent_id: '123', start: '10-05-2018' }
    ],
    [
        { agent_id: '456', start: '10-04-2018' },
        { agent_id: '456', start: '10-05-2018' }
    ]
];

function recursiveFunc(arrItem, resultingArr) {
    if (Array.isArray(arrItem) && arrItem.length) {
        let matchArr = []; let restArr = [];
        arrItem.every((v) => {
            if (!(v.start === arrItem[0].start)) {
                restArr.push(v);
            } else {
                matchArr.push(v);
            }
            return v.start === arrItem[0].start;
        });
        if (matchArr.length) resultingArr.push(matchArr);
        if (restArr.length > 1) {
            return recursiveFunc(restArr, resultingArr);
        } else {
            if (restArr.length) resultingArr.push(restArr);
        }
    }
}

let resultingArr = [];
input.forEach(arrItem => {
    recursiveFunc(arrItem, resultingArr);
});
console.log(resultingArr);

answered Sep 22, 2020 at 20:37

kavigun

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1 Comment

IrfanClemson Over a year ago

Hi, a non-Lodash solution would have been better. I had already accepted the first Answer which works, and if issues would come back to this topic. Thank you very much!!

Anatoly · Accepted Answer · 2020-09-22 19:46:08Z

1

Using groupBy method from lodash package:

const _ = require('lodash')

const items = [ 
[ 
  {agent_id: '123',   start: '10-05-2018'},
  { agent_id: '123', start: '10-05-2018'} 
],
[ 
  { agent_id: '456', start: '10-04-2018'},
  { agent_id: '456', start: '10-05-2018'} 
] 
]

const result = items
  .map(x => Object.values(_.groupBy(x, el => `${el.agent_id}:${el.start}`)))
  .reduce((curr, next) => curr.concat(next), [])

answered Sep 22, 2020 at 19:46

Anatoly

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2 Comments

IrfanClemson Over a year ago

Thank you. Going to install Lodash and give your Answer a try!

IrfanClemson Over a year ago

Yes sir. This is going to work! Thank you so much!!

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