Find specific key value in array of objects using nodejs

Question

We have a JSON object like

var jsons = {
    "LAPTOP": [{
        "productId": "123"
    }],
    "DESKTOP": [{
        "productId": "456"
    }],
    "MOUSE": [{
        "productId": "789"
    }, {
        "productId": "012"
    }],
    "KEY-BOARD": [{
        "productId": "345"
    }]
}

if we search { "productId": "012" } it should return key DESKTOP It would be great if we can use lodash

Gruff Bunny · Accepted Answer · 2018-01-17 08:24:34Z

2

A solution using lodash:

let result = _(jsons)
    .pickBy(item => _.some(item, {productId: '123'}))
    .keys()
    .head();

First we find the key where the value contains and object with the matching productId. We then take the first key from the collection of keys.

answered Jan 17, 2018 at 8:24

Gruff Bunny

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Comments

prabhatojha · Accepted Answer · 2018-01-17 07:13:22Z

2

Try this

var jsons = {
"LAPTOP": [{
    "productId": "123"
}],
"DESKTOP": [{
    "productId": "456"
}],
"MOUSE": [{
    "productId": "789"
}, {
    "productId": "012"
}],
"KEY-BOARD": [{
    "productId": "345"
}]};

var result = Object.keys(jsons).find((key) => {
	   return jsons[key].find((item) => item.productId === '123')
    });

console.log(result);

answered Jan 17, 2018 at 7:13

prabhatojha

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1 Comment

Stamos Over a year ago

I vote this cause its optimized and wont do unnecessary loops.

Aswin Ramesh · Accepted Answer · 2018-01-17 07:12:05Z

0

without LODASH you can have something like this

var toSearch = 789;
Object.keys(jsons).forEach((key) => {
  if(jsons[key].find((pid) => pid.productId == toSearch)){
    console.log(key)
  }
})

answered Jan 17, 2018 at 7:12

Aswin Ramesh

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Comments

Lalit · Accepted Answer · 2018-01-17 07:14:05Z

0

var jsons = {
"LAPTOP": [{
    "productId": "123"
}],
"DESKTOP": [{
    "productId": "456"
}],
"MOUSE": [{
    "productId": "789"
}, {
    "productId": "012"
}],
"KEY-BOARD": [{
    "productId": "345"
}]
};

var id = "789";
for(item in jsons){
  jsons[item].forEach(function(data){
    if(data.productId == id){
      console.log(item);
    }
  });
}

answered Jan 17, 2018 at 7:14

Lalit

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Comments

fingeron · Accepted Answer · 2018-01-17 07:14:14Z

0

You can use Javascript's key in object for loop syntax like so:

var jsons = {
"LAPTOP": [{
    "productId": "123"
}],
"DESKTOP": [{
    "productId": "456"
}],
"MOUSE": [{
    "productId": "789"
}],
"KEY-BOARD": [{
    "productId": "345"
}]};

var searchFor = "789";

for(var key in jsons) 
  if(jsons.hasOwnProperty(key))
    if(jsons[key][0] && jsons[key][0].productId === searchFor)
      alert(key); // MOUSE

answered Jan 17, 2018 at 7:14

fingeron

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Comments

Hassan Imam · Accepted Answer · 2018-01-17 09:44:28Z

0

You can use keys and find.

var jsons = { "LAPTOP": [{ "productId": "123" }], "DESKTOP": [{ "productId": "456" }], "MOUSE": [{ "productId": "789" }, { "productId": "012" }], "KEY-BOARD": [{ "productId": "345" }] },
    value = { "productId": "012" };

var result = _.find(_.keys(jsons), key => _.find(jsons[key], value));
console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

edited Jan 17, 2018 at 9:44

answered Jan 17, 2018 at 9:20

Hassan Imam

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Comments

vincent · Accepted Answer · 2021-01-13 01:09:39Z

0

Consider using object-scan. It's powerful once you wrap your head around it.

// const objectScan = require('object-scan');

const search = (term, input) => {
  const r = objectScan(['**.productId'], {
    abort: true,
    rtn: 'key',
    filterFn: ({ value }) => value === term
  })(input);
  return r === undefined ? r : r[0];
};

const jsons = { LAPTOP: [{ productId: '123' }], DESKTOP: [{ productId: '456' }], MOUSE: [{ productId: '789' }, { productId: '012' }], 'KEY-BOARD': [{ productId: '345' }] };

console.log(search('012', jsons));
// => MOUSE

.as-console-wrapper {max-height: 100% !important; top: 0}

<script src="https://bundle.run/[email protected]"></script>

Disclaimer: I'm the author of object-scan

edited Jan 13, 2021 at 1:09

answered Oct 24, 2020 at 14:35

vincent

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