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src/content/blog/2023/03/16/introducing-react-dev.md

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -269,7 +269,7 @@ Use the conditional operator (`cond ? a : b`) to render a ❌ if `isPacked` isn
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function Item({ name, isPacked }) {
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return (
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<li className="item">
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{name} {isPacked && ''}
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{name} {isPacked && ''}
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</li>
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);
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}
@@ -307,7 +307,7 @@ export default function PackingList() {
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function Item({ name, isPacked }) {
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return (
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<li className="item">
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{name} {isPacked ? '' : ''}
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{name} {isPacked ? '' : ''}
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</li>
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);
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}

src/content/learn/conditional-rendering.md

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@@ -52,13 +52,17 @@ export default function PackingList() {
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</Sandpack>
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<<<<<<< HEAD
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Зверніть увагу, що деякі компоненти `Item` мають проп `isPacked` встановлений на `true` замість `false`. Ви хочете додати позначку (✔) до запакованих речей, якщо `isPacked={true}`.
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=======
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Notice that some of the `Item` components have their `isPacked` prop set to `true` instead of `false`. You want to add a checkmark (✅) to packed items if `isPacked={true}`.
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>>>>>>> 7d50c3ffd4df2dc7903f4e41069653a456a9c223
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Ви можете зробити це за допомогою [оператора `if`/`else`](https://webdoky.org/uk/docs/Web/JavaScript/Reference/Statements/if...else) ось так:
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```js
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if (isPacked) {
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return <li className="item">{name} </li>;
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return <li className="item">{name} </li>;
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}
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return <li className="item">{name}</li>;
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```
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```js
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function Item({ name, isPacked }) {
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if (isPacked) {
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return <li className="item">{name} </li>;
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return <li className="item">{name} </li>;
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}
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return <li className="item">{name}</li>;
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}
@@ -159,7 +163,7 @@ export default function PackingList() {
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У попередньому прикладі ви контролювали, яке JSX-дерево буде повернено компонентом. Ви вже могли помітити деяке дублювання у виводі рендеру:
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```js
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<li className="item">{name} </li>
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<li className="item">{name} </li>
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```
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дуже схоже на
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```js
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if (isPacked) {
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return <li className="item">{name} </li>;
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return <li className="item">{name} </li>;
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}
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return <li className="item">{name}</li>;
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```
@@ -187,7 +191,7 @@ JavaScript має компактний синтаксис для написан
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```js
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if (isPacked) {
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return <li className="item">{name} </li>;
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return <li className="item">{name} </li>;
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}
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return <li className="item">{name}</li>;
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```
@@ -197,12 +201,16 @@ return <li className="item">{name}</li>;
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```js
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return (
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<li className="item">
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{isPacked ? name + ' ' : name}
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{isPacked ? name + ' ' : name}
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</li>
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);
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```
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<<<<<<< HEAD
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Це можна прочитати як *"якщо `isPacked` є true, тоді (`?`) відобразити `name + ' ✔'`, в іншому випадку (`:`) відобразити `name`"*.
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=======
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You can read it as *"if `isPacked` is true, then (`?`) render `name + ' ✅'`, otherwise (`:`) render `name`"*.
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>>>>>>> 7d50c3ffd4df2dc7903f4e41069653a456a9c223
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<DeepDive>
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<li className="item">
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{isPacked ? (
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<del>
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{name + ' '}
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{name + ' '}
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</del>
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) : (
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name
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```js
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return (
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<li className="item">
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{name} {isPacked && ''}
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{name} {isPacked && ''}
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</li>
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);
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```
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function Item({ name, isPacked }) {
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return (
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<li className="item">
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{name} {isPacked && ''}
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{name} {isPacked && ''}
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</li>
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);
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}
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```js
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if (isPacked) {
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itemContent = name + " ";
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itemContent = name + " ";
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}
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```
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function Item({ name, isPacked }) {
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let itemContent = name;
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if (isPacked) {
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itemContent = name + " ";
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itemContent = name + " ";
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}
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return (
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<li className="item">
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if (isPacked) {
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itemContent = (
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<del>
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{name + " "}
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{name + " "}
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</del>
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);
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}
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function Item({ name, isPacked }) {
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return (
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<li className="item">
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{name} {isPacked && ''}
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{name} {isPacked && ''}
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</li>
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);
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}
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function Item({ name, isPacked }) {
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return (
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<li className="item">
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{name} {isPacked ? '' : ''}
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{name} {isPacked ? '' : ''}
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</li>
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);
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}

src/content/learn/describing-the-ui.md

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@@ -327,7 +327,7 @@ export function getImageUrl(person, size = 's') {
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function Item({ name, isPacked }) {
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return (
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<li className="item">
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{name} {isPacked && ''}
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{name} {isPacked && ''}
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</li>
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);
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}

src/content/learn/you-might-not-need-an-effect.md

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@@ -408,9 +408,9 @@ function Game() {
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There are two problems with this code.
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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.
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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.
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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.
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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.
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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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vercel.json

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"destination": "/learn/rendering-lists#keeping-list-items-in-order-with-key",
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"permanent": false
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},
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{
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"source": "/docs/lists-and-keys",
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"destination": "/learn/rendering-lists#keeping-list-items-in-order-with-key",
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"permanent": false
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},
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{
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"source": "/link/invalid-hook-call",
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"destination": "/warnings/invalid-hook-call-warning",

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