How do I remove a key from a JavaScript object? [duplicate]

How do I remove a key from a JavaScript object? [duplicate]

This question already has an answer here:

How do I remove a property from a JavaScript object?

38 answers

Let’s say we have an object with this format:
var thisIsObject= {
‘Cow’ : ‘Moo’,
‘Cat’ : ‘Meow’,
‘Dog’ : ‘Bark’
};

I wanted to do a function that removes by key:
removeFromObjectByKey(‘Cow’);

Solutions/Answers:

Solution 1:

The delete operator allows you to remove a property from an object.

The following examples all do the same thing.

// Example 1
var key = "Cow";
delete thisIsObject[key]; 

// Example 2
delete thisIsObject["Cow"];

// Example 3
delete thisIsObject.Cow;

If you’re interested, read Understanding Delete for an in-depth explanation.

Solution 2:

If you are using Underscore.js or Lodash, there is a function ‘omit’ that will do it.
http://underscorejs.org/#omit

var thisIsObject= {
    'Cow' : 'Moo',
    'Cat' : 'Meow',
    'Dog' : 'Bark'
};
_.omit(thisIsObject,'Cow'); //It will return a new object

=> {'Cat' : 'Meow', 'Dog' : 'Bark'}  //result

If you want to modify the current object, assign the returning object to the current object.

thisIsObject = _.omit(thisIsObject,'Cow');

With pure JavaScript, use:

delete thisIsObject['Cow'];

Another option with pure JavaScript.

thisIsObject.cow = undefined;

thisIsObject = JSON.parse(JSON.stringify(thisIsObject ));

Solution 3:

It’s as easy as:

delete object.keyname;

or

delete object["keyname"];