Removing an element from a JSON array is a task that can be achieved

Question

Removing an element from a JSON array is a task that can be achieved

I'm diving into the world of nodejs and mongodb. Currently, I'm facing an issue with a JSON data structure that looks like this:

{ 
 _id: 199,
 name: 'Rae Kohout',
 scores: [ 
     { type: 'exam', score: 82.11742562118049 },
     { type: 'quiz', score: 49.61295450928224 },
     { type: 'homework', score: 28.86823689842918 },
     { type: 'homework', score: 5.861613903793295 }
 ]
}

Specifically, I need to compare scores for the 'homework' type and remove the homework entry with the lowest score. In my attempt to tackle this problem, I've come up with the following code snippet:

var low = '';
for(var i=0;i<doc.scores.length;i++)
{
 if(doc.scores[i].type == 'homework'){
   if(low == ''){
      low = doc.scores[i].score;
   }
   if( doc.scores[i].score > low ){
     console.log("index for lowest score is " + i);
     low = '';
   }
 }
}

At this point, I've successfully identified the index for the lowest score. However, I'm now struggling with removing values at that specific index as Array.splice() method only works on Arrays. Can someone provide guidance on how to solve this dilemma?

javascript arrays json

Answer 1

Answer №1

To remove an item from an array, you can use the splice method in this manner:

array.splice(indexToRemove, 1);

Answer 2

To remove an item from an array, you can use the splice method in this manner:

array.splice(indexToRemove, 1);

Answer 3

Answer №2

The splice() function is used to modify the contents of an array by either removing existing elements or adding new ones.

If you wish to eliminate 1 element starting from index 3, you can follow this example code snippet:

let myArray = ['dog', 'cat', 'bird', 'fish', 'hamster'];
let removedElement = myArray.splice(3, 1);

// removedElement will be ["fish"]
// myArray will now be ['dog', 'cat', 'bird', 'hamster']

Answer 4

The splice() function is used to modify the contents of an array by either removing existing elements or adding new ones.

If you wish to eliminate 1 element starting from index 3, you can follow this example code snippet:

let myArray = ['dog', 'cat', 'bird', 'fish', 'hamster'];
let removedElement = myArray.splice(3, 1);

// removedElement will be ["fish"]
// myArray will now be ['dog', 'cat', 'bird', 'hamster']

Removing an element from a JSON array is a task that can be achieved

Answer №1

Answer №2

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