Using a for loop to delete an object from an array without affecting the rest of the array

Question

I need to delete an employee from an array. I need to remove the full object for that employee (all of the key value pairs) with a function that will loop through the array and check for the key value firstName and delete the object based on the name.

Lets say the name is "Mike".

I want to use the splice command and a for loop. this is what I have currently... but I can't get it to detect and delete the object. I just get the full list returned.

function employeeUpdater() {
   for (let key in obj) {
      if (obj[key] === "Theo") {
         Array.splice();
      }
   }
   return(obj)
}

Welcome to SO! Can you show your data structure and actual/expected output? Thanks! — ggorlen
– ggorlen, Commented Nov 15, 2019 at 22:57
Please provide a sample of the data you are working with. A minimal reproducible example in other words. You can use Stack Snippets to make it easier for others to reproduce. — Heretic Monkey
– Heretic Monkey, Commented Nov 15, 2019 at 22:57

Andre Nuechter · Accepted Answer · 2019-11-15 23:01:49Z

1

Array.filter() seems much more appropriate for your task.

const data = [{ name: 'Mike' }, { name: 'Sam' }, { name: 'Sarah' }];

const filtered = data.filter(p => p.name !== 'Mike');

console.log(filtered);

answered Nov 15, 2019 at 23:01

Andre Nuechter

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programmerRaj · Accepted Answer · 2019-11-15 23:04:43Z

1

In order to do this, you must first loop through your array of employees. I am assuming that it is called employees.

The array splice() method has two parameters (for your purpose). The parameters are index and amountToDelete. For example, doing employees.splic(3, 1); will delete the fourth employee from the list.

Here's how you would do it in your context:

employees.forEach(function(obj, index){
    for (let key in obj){
        if (obj[key] === "Theo") {
            employees.splice(index, 1);
        }
    }
});

answered Nov 15, 2019 at 23:04

programmerRaj

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Comments

robsiemb · Accepted Answer · 2019-11-16 00:36:19Z

0

Get the keys.
Loop through keys, using them with object to get value.
If found, delete, then break as there's no need to continue.

Profit.

var keys = Object.keys(employees);

keys.forEach(k => {
  if (employees[k] == "Theo") {
    delete employees[k];
    break;
  }
});

edited Nov 16, 2019 at 0:36

robsiemb

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answered Nov 15, 2019 at 23:20

Ronan R

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3 Comments

Sushanth -- Over a year ago

This will mutate the original array and OP was requesting for a one which does not .

Ronan R Over a year ago

I believe you misread the title. "delete an object from an array without affecting the rest of the array" means to delete the object without deleting or affecting the other elements.

programmerRaj Over a year ago

So you want to make a copy of the array first?

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