61 lines
1.4 KiB
Markdown
61 lines
1.4 KiB
Markdown
---
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title: "🗃️ Перебор элементов в JavaScript"
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date: 2022-11-02T23:52:56+03:00
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draft: false
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tags: [javascript, development, tutorial]
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---
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## Массивы
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Синтаксис:
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```javascript
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arr.forEach(function callback(currentValue, index, array) {
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//your iterator
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}[, thisArg]);
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```
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Пример:
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```javascript
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let exampleArray = [
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{name: 'Alex', age: 15},
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{name: 'Regina', age: 21},
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];
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exampleArray.forEach((value, index) => {
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console.log(`${index} - ${value.name}: ${value.age}`);
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});
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```
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[Documentation on Developer.Mozilla](https://developer.mozilla.org/ru/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach)
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## Объекты
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Синтаксис:
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```javascript
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Object.entries(obj).forEach(([key, value]) => {
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console.log(`${key} ${value}`); // "a 5", "b 7", "c 9"
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});
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```
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Пример:
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```javascript
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let Buttons = {
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up: {x: 0, y: 10, pressed: false, callback: 'fButtonUp'},
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down: {x: 0, y: 0, pressed: false, callback: 'fButtonDown'},
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start: {x: 150, y: 50, pressed: false, callback: 'fButtonStart'},
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};
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Object.entries(Buttons).forEach(([key, value]) => {
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console.log(key, value.pressed);
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console.log(`Pos: ${Buttons[key].x}x${Buttons[key].y}`);
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console.log();
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console.log();
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});
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```
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[Documentation on Developer.Mozilla](https://developer.mozilla.org/ru/docs/Web/JavaScript/Reference/Global_Objects/Object/entries)
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