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Глубокое клонирование реактивных объектов в Vue 3

Vue 3 использует Proxy для реактивности, что создает проблемы при попытке клонировать объекты. Стандартные методы работают не так, как ожидается:

const state = reactive({ user: { name: "Al" } });

// Проблемы:
const badCopy1 = { ...state }; // сохраняет Proxy-ссылки
const badCopy2 = JSON.parse(JSON.stringify(state)); // теряет методы и Proxy


3 рабочих способа

1. Комбинация toRaw + structuredClone

import { toRaw } from 'vue';

const original = reactive({ data: 123 });
const copy = structuredClone(toRaw(original));


2. Ручное глубокое копирование

function deepClone(obj) {
if (obj === null || typeof obj !== 'object') return obj;
const clone = Array.isArray(obj) ? [] : {};
for (const key in obj) {
clone[key] = deepClone(obj[key]);
}
return clone;
}

const copy = reactive(deepClone(toRaw(original)));


3. Библиотечные решения

import { cloneDeep } from 'lodash-es';
const copy = reactive(cloneDeep(toRaw(obj)));


#tip #reactivity



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Глубокое клонирование реактивных объектов в Vue 3

Vue 3 использует Proxy для реактивности, что создает проблемы при попытке клонировать объекты. Стандартные методы работают не так, как ожидается:

const state = reactive({ user: { name: "Al" } });

// Проблемы:
const badCopy1 = { ...state }; // сохраняет Proxy-ссылки
const badCopy2 = JSON.parse(JSON.stringify(state)); // теряет методы и Proxy


3 рабочих способа

1. Комбинация toRaw + structuredClone

import { toRaw } from 'vue';

const original = reactive({ data: 123 });
const copy = structuredClone(toRaw(original));


2. Ручное глубокое копирование

function deepClone(obj) {
if (obj === null || typeof obj !== 'object') return obj;
const clone = Array.isArray(obj) ? [] : {};
for (const key in obj) {
clone[key] = deepClone(obj[key]);
}
return clone;
}

const copy = reactive(deepClone(toRaw(original)));


3. Библиотечные решения

import { cloneDeep } from 'lodash-es';
const copy = reactive(cloneDeep(toRaw(obj)));


#tip #reactivity

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The SSE was the first modern stock exchange to open in China, with trading commencing in 1990. It has now grown to become the largest stock exchange in Asia and the third-largest in the world by market capitalization, which stood at RMB 50.6 trillion (US$7.8 trillion) as of September 2021. Stocks (both A-shares and B-shares), bonds, funds, and derivatives are traded on the exchange. The SEE has two trading boards, the Main Board and the Science and Technology Innovation Board, the latter more commonly known as the STAR Market. The Main Board mainly hosts large, well-established Chinese companies and lists both A-shares and B-shares.

Spiking bond yields driving sharp losses in tech stocks

A spike in interest rates since the start of the year has accelerated a rotation out of high-growth technology stocks and into value stocks poised to benefit from a reopening of the economy. The Nasdaq has fallen more than 10% over the past month as the Dow has soared to record highs, with a spike in the 10-year US Treasury yield acting as the main catalyst. It recently surged to a cycle high of more than 1.60% after starting the year below 1%. But according to Jim Paulsen, the Leuthold Group's chief investment strategist, rising interest rates do not represent a long-term threat to the stock market. Paulsen expects the 10-year yield to cross 2% by the end of the year. A spike in interest rates and its impact on the stock market depends on the economic backdrop, according to Paulsen. Rising interest rates amid a strengthening economy "may prove no challenge at all for stocks," Paulsen said.

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