不可变地删除对象中的属性

我正在使用Redux.在我的reducer中,我试图从像这样的对象中删除一个属性:

const state = {
    a: '1',
    b: '2',
    c: {
       x: '42',
       y: '43'
    },
}

我希望有这样的东西,而不必改变原始状态:

const newState = {
    a: '1',
    b: '2',
    c: {
       x: '42',
    },
}

我试过了:

let newState = Object.assign({}, state);
delete newState.c.y

但由于某些原因,它会删除两个州的财产.

可以帮我这么做吗？

如何使用解构赋值语法？

const original = {
  foo: 'bar',
  stack: 'overflow',
};

// If the name of the property to remove is constant
const { stack, ...withoutFirst } = original;
console.log(withoutFirst); // Will be { "foo": "bar" }

// If the name of the property to remove is from a variable
const key = 'stack'
const { [key]: value, ...withoutSecond } = original;
console.log(withoutSecond); // Will be { "foo": "bar" }

// To do a deep removal with property names from variables
const deep = {
  foo: 'bar',
  c: {
   x: 1,
   y: 2
  }
};

const parentKey = 'c';
const childKey = 'y';
// Remove the 'c' element from original
const { [parentKey]: parentValue, ...noChild } = deep;
// Remove the 'y' from the 'c' element
const { [childKey]: removedValue, ...childWithout } = parentValue;
// Merge back together
const withoutThird = { ...noChild, [parentKey]: childWithout };
console.log(withoutThird); // Will be { "foo": "bar", "c": { "x": 1 } }

return Object.assign({}, state, {
    c: Object.keys(state.c).reduce((result, key) => {
        if (key !== 'y') {
            result[key] = state.c[key];
        }
        return result;
    }, {})
});

const state = {
    c: {
       x: '42',
       y: '43'
    },
}

const { c: { y, ...c } } = state // generates a new 'c' without 'y'

console.log({...state, c }) // put the new c on a new state

let newState = Object.assign({}, state);
console.log(newState == state); // false
console.log(newState.c == state.c); // true
newState.c = Object.assign({}, state.c);
console.log(newState.c == state.c); // now it is false
delete newState.c.y;

function removeByKey (myObj, deleteKey) {
  return Object.keys(myObj)
    .filter(key => key !== deleteKey)
    .reduce((result, current) => {
      result[current] = myObj[current];
      return result;
  }, {});
}

function dissoc(key, obj) {
  let copy = Object.assign({}, obj)
  delete copy[key]
  return copy
}

import update from 'immutability-helper';

const updatedState = update(state, {
  c: {
    $unset: ['y']
  }
});    

const newState = state.deleteIn(['c', 'y']);