Guide to looping through a JSON object in JavaScript and removing a particular JSON entry depending on a condition

Question

Guide to looping through a JSON object in JavaScript and removing a particular JSON entry depending on a condition

I've already done a thorough search and couldn't find a match, so please don't ask about any copy-pasted solutions before you ask your question. :)

Now, in JavaScript(ES6), I am working with this JSON data:

var myJson = {
   'hello' : {x: 11, y:22},
   'there' : {x:99, y:100}
};

I understand that to delete a row from a JSON object, I can simply use the delete keyword. However, my challenge lies in deleting rows based on a certain condition, such as deleting all rows where the value of X is greater than 50. For example,

delete myJson['there'].

The issue here is that I do not know beforehand which key will meet this criteria, so using delete directly is not feasible. I have also researched (not confirmed) that looping over this JSON object and accessing the loop index to remove a specific row like in an array would not work due to the structure of objects.

Considering the condition to exclude rows where X > 50, the desired final output should be:

myJson = {
       'hello' : {x: 11, y:22}
    };

Appreciate any insights or suggestions! Thanks!

javascript json ecmascript-6

Answer 1

Answer №1

Check out this solution. The purpose of using the hasOwnProperty method is to verify if the key belongs to the object itself and not its prototype.

var myObject = {
   'hi' : {x: 11, y:22},
   'bye' : {x:99, y:100}
};

for(var property in myObject) {
    if(myObject.hasOwnProperty(property)) {
        if(myObject[property].x > 50) {
            delete myObject[property];
        }
    }
}

console.log(myObject);

I changed the variable name to myObject as it was not in JSON format. To convert the object into JSON, you can use the following code:

var myObject = {
   'hello' : {x: 11, y:22},
   'there' : {x:99, y:100}
};

var myJson = JSON.stringify(myObject);

console.log(myJson);

Answer 2

Check out this solution. The purpose of using the hasOwnProperty method is to verify if the key belongs to the object itself and not its prototype.

var myObject = {
   'hi' : {x: 11, y:22},
   'bye' : {x:99, y:100}
};

for(var property in myObject) {
    if(myObject.hasOwnProperty(property)) {
        if(myObject[property].x > 50) {
            delete myObject[property];
        }
    }
}

console.log(myObject);

I changed the variable name to myObject as it was not in JSON format. To convert the object into JSON, you can use the following code:

var myObject = {
   'hello' : {x: 11, y:22},
   'there' : {x:99, y:100}
};

var myJson = JSON.stringify(myObject);

console.log(myJson);

Answer 3

Answer №2

let sampleObject = {
   'alpha' : {a: 40, b:60},
   'beta' : {a:90, b:120}
};


for( element in sampleObject) {
  if (sampleObject[element].a > 70) {
    delete sampleObject[element];
  }
}

Answer 4

let sampleObject = {
   'alpha' : {a: 40, b:60},
   'beta' : {a:90, b:120}
};


for( element in sampleObject) {
  if (sampleObject[element].a > 70) {
    delete sampleObject[element];
  }
}

Guide to looping through a JSON object in JavaScript and removing a particular JSON entry depending on a condition

Answer №1

Answer №2

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