How to Clone a JavaScript Object Except for One Key

How can I clone a JavaScript object except for one key?

There is a Destructuring assignment syntax in JavaScript that can be used

let obj = {a: 1, b: 2, c: 3, z:26};
let {b, ...rest} = obj;

// skips the "Unused variable" warning
let {b: _, ...rest} = obj;

// removes property based on the dynamic key
const dynamicKey = "b";
let {[dynamicKey]: _, ...rest} = obj;

Modern browsers already support it out of the box.
See: JavaScript operator: Destructuring assignment: Rest in objects

For old browser versions there is an option to use Babel to support destructuring assignment. It will be transpiled into:

"use strict";

function _objectWithoutProperties(obj, keys) {
  var target = {};
  for (var i in obj) {
    if (keys.indexOf(i) >= 0) continue;
    if (!Object.prototype.hasOwnProperty.call(obj, i)) continue;
    target[i] = obj[i];
  }
  return target;
}

var x = { a: 1, b: 2, c: 3, z: 26 };
var b = x.b;

var y = _objectWithoutProperties(x, ["b"]);

Typescript how to clone object except for one key

What you need is spread operator (check the "Object Spread and Rest" part). Typescript is a superset of JavaScript, both of them support this feature.

const {adminPasswords, ...state} = initialStateFromDB;
const initialState: InitialState = {
  ...state,
  adminPasswords: JSON.parse(adminPasswords)
}

Copy all elements from one object except those with that share their key with an element in another object

Your last example is a good start. You can combine it with Object.keys to achieve what you want:

let obj1 = {  a: 1,  b: 2,  c: 3,  d: 4}
let obj2 = {  a: "foo",  c: "bar"}
const obj3 = Object.assign({}, obj1);Object.keys(obj2).forEach(key => delete obj3[key]);
console.log(obj3);

exclude specific key/value pairs by key name when copy contents from one object to another

You could use Object destructuring so that it will assign created, updated values, and rest other properties assign in a single object.

As you are using VUE, so add the following snippet before all import in script tag in x.vue file. SEE FOR VUE

// eslint-disable-next-line no-unused-vars

Disallow Unused Variables (no-unused-vars)

If error still persist then change the ESLint config in package.json

"rules": {
   "no-unused-vars": "off"
}

const dataFromParent = {
  itemid: "104",
  itemname: "insurance",
  itemtype: "expense",
  unitofmeasure: "$/yr",
  created: "2021-04-14 05:59:30.097",
  updated: "2021-04-14 05:59:30.097",
};

const { created, updated, ...rest } = dataFromParent; // make a shallow copy to avoid changing original object values
const data = rest;

console.log(data);

Check all value of Object except one

Use destructuring to extract the date and the rest of the properties and calculate the sum of the Object.values using Array.reduce :

const obj = { date: "2019-10-03", hello: 0, yo: 0, test: 0 };
const { date, ...rest } = obj;
const sum = Object.values(rest).reduce((sum, curr) => sum + curr, 0);const allZeros = sum === 0 ? true : false;
console.log(allZeros);

Copy all elements from one object except those with that share their key with an element in another object

Your last example is a good start. You can combine it with Object.keys to achieve what you want:

let obj1 = {  a: 1,  b: 2,  c: 3,  d: 4}
let obj2 = {  a: "foo",  c: "bar"}
const obj3 = Object.assign({}, obj1);Object.keys(obj2).forEach(key => delete obj3[key]);
console.log(obj3);

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