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Merge pull request #563 from reactjs/sync-7d50c3ff
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Sync with react.dev @ 7d50c3f
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alinkedd authored Aug 26, 2024
2 parents c92aef2 + b237707 commit aeae19e
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4 changes: 2 additions & 2 deletions src/content/blog/2023/03/16/introducing-react-dev.md
Original file line number Diff line number Diff line change
Expand Up @@ -269,7 +269,7 @@ Use the conditional operator (`cond ? a : b`) to render a ❌ if `isPacked` isn
function Item({ name, isPacked }) {
return (
<li className="item">
{name} {isPacked && ''}
{name} {isPacked && ''}
</li>
);
}
Expand Down Expand Up @@ -307,7 +307,7 @@ export default function PackingList() {
function Item({ name, isPacked }) {
return (
<li className="item">
{name} {isPacked ? '' : ''}
{name} {isPacked ? '' : ''}
</li>
);
}
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32 changes: 16 additions & 16 deletions src/content/learn/conditional-rendering.md
Original file line number Diff line number Diff line change
Expand Up @@ -52,13 +52,13 @@ export default function PackingList() {

</Sandpack>

Зверніть увагу, що деякі компоненти `Item` мають проп `isPacked` встановлений на `true` замість `false`. Ви хочете додати позначку () до запакованих речей, якщо `isPacked={true}`.
Зверніть увагу, що деякі компоненти `Item` мають проп `isPacked` встановлений на `true` замість `false`. Ви хочете додати позначку () до запакованих речей, якщо `isPacked={true}`.

Ви можете зробити це за допомогою [оператора `if`/`else`](https://webdoky.org/uk/docs/Web/JavaScript/Reference/Statements/if...else) ось так:

```js
if (isPacked) {
return <li className="item">{name} </li>;
return <li className="item">{name} </li>;
}
return <li className="item">{name}</li>;
```
Expand All @@ -70,7 +70,7 @@ return <li className="item">{name}</li>;
```js
function Item({ name, isPacked }) {
if (isPacked) {
return <li className="item">{name} </li>;
return <li className="item">{name} </li>;
}
return <li className="item">{name}</li>;
}
Expand Down Expand Up @@ -159,7 +159,7 @@ export default function PackingList() {
У попередньому прикладі ви контролювали, яке JSX-дерево буде повернено компонентом. Ви вже могли помітити деяке дублювання у виводі рендеру:

```js
<li className="item">{name} </li>
<li className="item">{name} </li>
```

дуже схоже на
Expand All @@ -172,7 +172,7 @@ export default function PackingList() {

```js
if (isPacked) {
return <li className="item">{name} </li>;
return <li className="item">{name} </li>;
}
return <li className="item">{name}</li>;
```
Expand All @@ -187,7 +187,7 @@ JavaScript має компактний синтаксис для написан

```js
if (isPacked) {
return <li className="item">{name} </li>;
return <li className="item">{name} </li>;
}
return <li className="item">{name}</li>;
```
Expand All @@ -197,12 +197,12 @@ return <li className="item">{name}</li>;
```js
return (
<li className="item">
{isPacked ? name + ' ' : name}
{isPacked ? name + ' ' : name}
</li>
);
```

Це можна прочитати як *"якщо `isPacked` є true, тоді (`?`) відобразити `name + ' '`, в іншому випадку (`:`) відобразити `name`"*.
Це можна прочитати як *"якщо `isPacked` є true, тоді (`?`) рендерити `name + ' '`, в іншому випадку (`:`) рендерити `name`"*.

<DeepDive>

Expand All @@ -222,7 +222,7 @@ function Item({ name, isPacked }) {
<li className="item">
{isPacked ? (
<del>
{name + ' '}
{name + ' '}
</del>
) : (
name
Expand Down Expand Up @@ -265,7 +265,7 @@ export default function PackingList() {
```js
return (
<li className="item">
{name} {isPacked && ''}
{name} {isPacked && ''}
</li>
);
```
Expand All @@ -280,7 +280,7 @@ return (
function Item({ name, isPacked }) {
return (
<li className="item">
{name} {isPacked && ''}
{name} {isPacked && ''}
</li>
);
}
Expand Down Expand Up @@ -337,7 +337,7 @@ let itemContent = name;

```js
if (isPacked) {
itemContent = name + " ";
itemContent = name + " ";
}
```

Expand All @@ -357,7 +357,7 @@ if (isPacked) {
function Item({ name, isPacked }) {
let itemContent = name;
if (isPacked) {
itemContent = name + " ";
itemContent = name + " ";
}
return (
<li className="item">
Expand Down Expand Up @@ -401,7 +401,7 @@ function Item({ name, isPacked }) {
if (isPacked) {
itemContent = (
<del>
{name + " "}
{name + " "}
</del>
);
}
Expand Down Expand Up @@ -464,7 +464,7 @@ export default function PackingList() {
function Item({ name, isPacked }) {
return (
<li className="item">
{name} {isPacked && ''}
{name} {isPacked && ''}
</li>
);
}
Expand Down Expand Up @@ -502,7 +502,7 @@ export default function PackingList() {
function Item({ name, isPacked }) {
return (
<li className="item">
{name} {isPacked ? '' : ''}
{name} {isPacked ? '' : ''}
</li>
);
}
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2 changes: 1 addition & 1 deletion src/content/learn/describing-the-ui.md
Original file line number Diff line number Diff line change
Expand Up @@ -327,7 +327,7 @@ export function getImageUrl(person, size = 's') {
function Item({ name, isPacked }) {
return (
<li className="item">
{name} {isPacked && ''}
{name} {isPacked && ''}
</li>
);
}
Expand Down
4 changes: 2 additions & 2 deletions src/content/learn/you-might-not-need-an-effect.md
Original file line number Diff line number Diff line change
Expand Up @@ -408,9 +408,9 @@ function Game() {
There are two problems with this code.
One problem is that it is very inefficient: the component (and its children) have to re-render between each `set` call in the chain. In the example above, in the worst case (`setCard` → render → `setGoldCardCount` → render → `setRound` → render → `setIsGameOver` → render) there are three unnecessary re-renders of the tree below.
First problem is that it is very inefficient: the component (and its children) have to re-render between each `set` call in the chain. In the example above, in the worst case (`setCard` → render → `setGoldCardCount` → render → `setRound` → render → `setIsGameOver` → render) there are three unnecessary re-renders of the tree below.
Even if it weren't slow, as your code evolves, you will run into cases where the "chain" you wrote doesn't fit the new requirements. Imagine you are adding a way to step through the history of the game moves. You'd do it by updating each state variable to a value from the past. However, setting the `card` state to a value from the past would trigger the Effect chain again and change the data you're showing. Such code is often rigid and fragile.
The second problem is that even if it weren't slow, as your code evolves, you will run into cases where the "chain" you wrote doesn't fit the new requirements. Imagine you are adding a way to step through the history of the game moves. You'd do it by updating each state variable to a value from the past. However, setting the `card` state to a value from the past would trigger the Effect chain again and change the data you're showing. Such code is often rigid and fragile.
In this case, it's better to calculate what you can during rendering, and adjust the state in the event handler:
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5 changes: 5 additions & 0 deletions vercel.json
Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,11 @@
"destination": "/learn/rendering-lists#keeping-list-items-in-order-with-key",
"permanent": false
},
{
"source": "/docs/lists-and-keys",
"destination": "/learn/rendering-lists#keeping-list-items-in-order-with-key",
"permanent": false
},
{
"source": "/link/invalid-hook-call",
"destination": "/warnings/invalid-hook-call-warning",
Expand Down

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