JavaScript - Built in Function to Delete Multiple Keys in an Object?

Question

Here's a one-liner similar to what you're requesting.

var obj = {a: 1, b: 2, c: 3, d: 4, e: 5 };

['c', 'e'].forEach(e => delete obj[e]);

// obj is now {a:1, b:2, d:4}

You can also use Object Destructuring.

const obj = {
        a: 'dog',
        b: 'cat',
        c: 'mouse',
        d: 'cow',
        e: 'horse',
    };
const {a, e, ...updatedObject} = obj;

// output
console.log(updatedObject)

There is no built in js function to delete multiple keys yet, you can use any library for this such as underscore.js to do this.

_.omit({name: 'moe', age: 50, userid: 'moe1'}, 'userid');
=> {name: 'moe', age: 50}

//or you can use function to filter keys 

_.omit({name: 'moe', age: 50, userid: 'moe1'}, function(value, key, object){
  return _.isNumber(value);
});
=> {name: 'moe', userid: 'moe1'}

There is no built-in function, but one way you could do it is to add the multidelete method to the Object prototype. It's perhaps a little bit overkill, but you might find it useful.

if (!('multidelete' in Object.prototype)) {
    Object.defineProperty(Object.prototype, 'multidelete', {
        value: function () {
            for (var i = 0; i < arguments.length; i++) {
                delete this[arguments[i]];
            }
        }
    });
}

var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };

obj.multidelete('c', 'e'); // { a: 1, b: 2, d: 4 };

DEMO

There is one simple fix using the library lodash.

The _.omit function takes your object and an array of keys that you want to remove and returns a new object with all the properties of the original object except those mentioned in the array.

This is a neat way of removing keys as using this you get a new object and the original object remains untouched. This avoids the problem of mutation where if we removed the keys in the original object all the other parts of code using that object might have a tendency to break or introduce bugs in the code.

Example:

var obj = {x:1, y:2, z:3};
var result = _.omit(obj, ['x','y']);
console.log(result);

//Output
result = {z:3};

Link for the documentation of the same Click Here