What is the best way to change the value of a key in a JSON Object?

Question

What is the best way to change the value of a key in a JSON Object?

I am currently utilizing _underscore library. My goal is to change the value of a specific key.

var users = [{
    "_id": { "$oid":"3426" },
    "name":"peeter"
}, {
    "_id": { "$oid":"5a027" },
    "name":"ken"
}, {
    "_id": { "$oid":"5999" },
    "name":"karmal"
}];
 
var index = _.find(users, function(o) { return o._id.$oid == '5999'; });
console.log(index);

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

In the output displayed in console.log(index), I aim to modify the value of the key (name) by appending "-Copy".

Desired result

{
    "_id": {
        "$oid": "5999"
    },
    "name": "karmal-Copy"
}

I only intend to add -Copy to the existing value of the key (name).

javascript json underscore.js

Answer 1

Answer №1

Simply make changes to the located object.

var users = [{ _id: { $oid: "3426" }, name: "peeter" }, { _id: { $oid: "5a027" }, name:"ken" }, { _id: { $oid: "5999" }, name: "karmal" }],
    item = _.find(users, function(o) { return o._id.$oid == '5999'; });

if (item) {               // verify if item is found
    item.name += '-Copy'; // modify property value
}
console.log(users);

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

Answer 2

Simply make changes to the located object.

var users = [{ _id: { $oid: "3426" }, name: "peeter" }, { _id: { $oid: "5a027" }, name:"ken" }, { _id: { $oid: "5999" }, name: "karmal" }],
    item = _.find(users, function(o) { return o._id.$oid == '5999'; });

if (item) {               // verify if item is found
    item.name += '-Copy'; // modify property value
}
console.log(users);

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

Answer 3

Answer №2

Using the strength of Higher-order functions

var users = [
    {"_id":{"$oid":"3426"},
    "name":"peeter"
    },
    {"_id":{"$oid":"5a027"},
    "name":"ken"
    },
    {"_id":{"$oid":"5999"},
    "name":"karmal"
    }
  ];

var findSpecific$oid=function(oid){ 
    return function(obj) { return obj["_id"]["$oid"]===oid; };
  }

var appendExtensionInName=function(extension){ 
    return function(obj){ 
        var newObj = {};
        newObj["_id"]=obj["_id"]
        newObj["name"]=obj["name"] +"-"+extension;
        return newObj;
      };
  }

var selectedUser=users.filter(findSpecific$oid("5999")).map(appendExtensionInName("copy"))

Answer 4

Using the strength of Higher-order functions

var users = [
    {"_id":{"$oid":"3426"},
    "name":"peeter"
    },
    {"_id":{"$oid":"5a027"},
    "name":"ken"
    },
    {"_id":{"$oid":"5999"},
    "name":"karmal"
    }
  ];

var findSpecific$oid=function(oid){ 
    return function(obj) { return obj["_id"]["$oid"]===oid; };
  }

var appendExtensionInName=function(extension){ 
    return function(obj){ 
        var newObj = {};
        newObj["_id"]=obj["_id"]
        newObj["name"]=obj["name"] +"-"+extension;
        return newObj;
      };
  }

var selectedUser=users.filter(findSpecific$oid("5999")).map(appendExtensionInName("copy"))

Answer 5

Answer №3

Give this a shot:

for(let j = 0; j < clients.length; j++) {
    if(clients[j]._id.$oid == 5999) {
        clients[j].name += "-Duplicate"; 
    }
}

Answer 6

Give this a shot:

for(let j = 0; j < clients.length; j++) {
    if(clients[j]._id.$oid == 5999) {
        clients[j].name += "-Duplicate"; 
    }
}

Answer 7

Answer №4

Here is the code snippet:

var users = [
  {"_id":{"$oid":"3426"},
  "name":"peeter"
  },
  {"_id":{"$oid":"5a027"},
  "name":"ken"
  },
  {"_id":{"$oid":"5999"},
  "name":"karmal"
  }
];
 
var result = _.find(users, function(obj) { 
    if(obj._id.$oid == '5999'){
      obj.name += '-Duplicate';
      return obj._id.$oid == '5999'; 
    }
  });

console.log(result);

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

Answer 8

Here is the code snippet:

var users = [
  {"_id":{"$oid":"3426"},
  "name":"peeter"
  },
  {"_id":{"$oid":"5a027"},
  "name":"ken"
  },
  {"_id":{"$oid":"5999"},
  "name":"karmal"
  }
];
 
var result = _.find(users, function(obj) { 
    if(obj._id.$oid == '5999'){
      obj.name += '-Duplicate';
      return obj._id.$oid == '5999'; 
    }
  });

console.log(result);

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

What is the best way to change the value of a key in a JSON Object?

Answer №1

Answer №2

Answer №3

Answer №4

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