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Challenge: Iteration with for...of | Mastering Arrays
JavaScript Data Structures
course content

Conteúdo do Curso

JavaScript Data Structures

JavaScript Data Structures

1. Introduction and Prerequisites
2. Objects Fundamentals
3. Advanced Object Manipulation
4. Mastering Arrays
5. Advanced Array Operations

bookChallenge: Iteration with for...of

Task

You are given an array of objects. Each object represents a friend's information. The task is to create a for...of loop to iterate through the array and add one more property to each object that should be: online: false.

  1. Use a for...of loop to iterate through the friends array.
  2. Inside the for...of loop, use the dot notation to add the property.
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const friends = [ { name: "Gail Russel", address: "803 Kozey Rapid", phone: "(317) 833-9935 41777", }, { name: "Mrs. Laurie Wunsch", address: "7361 Austin Road", phone: "(728) 884-9049 4760", }, ]; // Use a `for...of` loop for (const friend of ___) { friend.___ = ___; } // Logging specific properties after modifications for (const friend of friends) { console.log( `Friend name is ${friend.name}, ${friend.online ? "online" : "offline"}` ); }
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Expected Output:

  1. To create a for...of loop, use the following syntax: for (const element of array) { ... }.
  2. Use the dot notation (.) to add a property (online) and assign it the value false.
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const friends = [ { name: "Gail Russel", address: "803 Kozey Rapid", phone: "(317) 833-9935 41777", }, { name: "Mrs. Laurie Wunsch", address: "7361 Austin Road", phone: "(728) 884-9049 4760", }, ]; // Use a `for...of` loop for (const friend of friends) { friend.online = false; } // Logging specific properties after modifications for (const friend of friends) { console.log( `Friend name is ${friend.name}, ${friend.online ? "online" : "offline"}` ); }
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Seção 4. Capítulo 8
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