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JavaScript One Solution

Posted by Yuting Le
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Yuting Le
Full Stack JavaScript Techdegree Graduate 20,125 Points

Can someone explain more about this code snippet?

I am confused about the code in this video (https://teamtreehouse.com/library/one-solution-27).

/* GET recipe page. */
router.get('/recipes/:id', function(req, res, next) {
  const recipeId = req.params.id;
  const recipe = recipes.find( ({ id }) => id === +recipeId );

{ id }: Why id is in the {}?

id === +recipeId: Why there's a + in front of. the recipeId?

1 Answer

Zimri Leijen
Zimri Leijen
11,835 Points

({ id }) => id === +recipeId

is a function which is defined in the recipes object. recipes.find apparently passes on object as an argument, but in this case you're only interested in the id.

Therefore you are using object destructuring to get only the id.

The + in front of recipeId will change the type of recipeId from a string to a number. It's a unary plus