84 lines
2.8 KiB
Markdown
84 lines
2.8 KiB
Markdown
---
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id: 587d7b89367417b2b2512b4a
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title: Use Destructuring Assignment to Assign Variables from Nested Objects
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challengeType: 1
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forumTopicId: 301214
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localeTitle: Назначение Destructuring для назначения переменных из вложенных объектов
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---
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## Description
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<section id='description'>
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Подобным же образом мы можем разрушить <em>вложенные</em> объекты в переменные. Рассмотрим следующий код: <blockquote> const a = { <br> start: {x: 5, y: 6}, <br> end: {x: 6, y: -9} <br> }; <br> const {start: {x: startX, y: startY}} = a; <br> console.log (startX, startY); // 5, 6 </blockquote> В приведенном выше примере <code>start</code> переменной присваивается значение <code>a.start</code> , которое также является объектом.
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</section>
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## Instructions
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<section id='instructions'>
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Используйте назначение destructuring, чтобы получить <code>max</code> <code>forecast.tomorrow</code> И назначьте его <code>maxOfTomorrow</code> .
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: You should remove the ES5 assignment syntax.
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testString: assert(!code.match(/lowToday = LOCAL_FORECAST\.today\.low/g) && !code.match(/highToday = LOCAL_FORECAST\.today.high/g))
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- text: You should use destructuring to create the <code>lowToday</code> variable.
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testString: assert(code.match(/(var|const|let)\s*{\s*today\s*:\s*{\s*(low\s*:\s*lowToday[^}]*|[^,]*,\s*low\s*:\s*lowToday\s*)}\s*}\s*=\s*LOCAL_FORECAST(;|\s+|\/\/)/g));
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- text: You should use destructuring to create the <code>highToday</code> variable.
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testString: assert(code.match(/(var|const|let)\s*{\s*today\s*:\s*{\s*(high\s*:\s*highToday[^}]*|[^,]*,\s*high\s*:\s*highToday\s*)}\s*}\s*=\s*LOCAL_FORECAST(;|\s+|\/\/)/g));
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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const LOCAL_FORECAST = {
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yesterday: { low: 61, high: 75 },
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today: { low: 64, high: 77 },
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tomorrow: { low: 68, high: 80 }
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};
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// change code below this line
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const lowToday = LOCAL_FORECAST.today.low;
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const highToday = LOCAL_FORECAST.today.high;
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// change code above this line
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console.log(lowToday); // should be 64
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console.log(highToday); // should be 77
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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const LOCAL_FORECAST = {
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yesterday: { low: 61, high: 75 },
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today: { low: 64, high: 77 },
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tomorrow: { low: 68, high: 80 }
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};
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// change code below this line
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const { today: { low: lowToday, high: highToday }} = LOCAL_FORECAST;
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// change code above this line
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console.log(highToday); // should be 77
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console.log(highTomorrow); // should be 80
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```
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</section>
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