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@ -579,13 +579,17 @@ console.log(copyPerson.hasOwnProperty('score'))
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```
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Imagine you are getting the above users collection from a MongoDB database.
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a. Create a function called signUp which allows user to add to the collection. If user exists, inform the user that he has already an account.
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b. Create a function called signIn which allows user to sign in to the application
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2. Imagine you are getting the above users collection from a MongoDB database.
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**a.** Create a function called signUp which allows user to add to the collection. If user exists, inform the user that he has already an account.
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**b.** Create a function called signIn which allows user to sign in to the application
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3. The products array has three elements and each of them has six properties.
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a. Create a function called rateProduct which rates the product
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b. Create a function called averageRating which calculate the average rating of a product
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**a.** Create a function called rateProduct which rates the product.
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**b.** Create a function called averageRating which calculate the average rating of a product
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4. Create a function called likeProduct. This function will helps to like to the product if it is not liked and remove like if it was liked.
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