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Use Destructuring Assignment to Assign Variables from Nested Objects

curriculum/challenges/english/blocks/es6/587d7b89367417b2b2512b4a.md

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--description--

You can use the same principles from the previous two lessons to destructure values from nested objects.

Using an object similar to previous examples:

js
const user = {
  johnDoe: { 
    age: 34,
    email: '[email protected]'
  }
};

Here's how to extract the values of object properties and assign them to variables with the same name:

js
const { johnDoe: { age, email }} = user;

And here's how you can assign an object properties' values to variables with different names:

js
const { johnDoe: { age: userAge, email: userEmail }} = user;

--instructions--

Replace the two assignments with an equivalent destructuring assignment. It should still assign the variables lowToday and highToday the values of today.low and today.high from the LOCAL_FORECAST object.

--hints--

You should remove the ES5 assignment syntax.

js
assert(
  !__helpers.removeJSComments(code).match(/lowToday = LOCAL_FORECAST\.today\.low/g) &&
    !__helpers.removeJSComments(code).match(/highToday = LOCAL_FORECAST\.today.high/g)
);

You should use destructuring to create the lowToday variable.

js
assert(
  __helpers.removeJSComments(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
  )
);

You should use destructuring to create the highToday variable.

js
assert(
  __helpers.removeJSComments(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
  )
);

lowToday should be equal to 64 and highToday should be equal to 77.

js
assert(lowToday === 64 && highToday === 77);

--seed--

--seed-contents--

js
const LOCAL_FORECAST = {
  yesterday: { low: 61, high: 75 },
  today: { low: 64, high: 77 },
  tomorrow: { low: 68, high: 80 }
};

// Only change code below this line
  
const lowToday = LOCAL_FORECAST.today.low;
const highToday = LOCAL_FORECAST.today.high;

// Only change code above this line

--solutions--

js
const LOCAL_FORECAST = {
  yesterday: { low: 61, high: 75 },
  today: { low: 64, high: 77 },
  tomorrow: { low: 68, high: 80 }
};
 
const { today: { low: lowToday, high: highToday }} = LOCAL_FORECAST;