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JavaScript Data Structures

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Challenge: Modify Array Elements

Task

The task is to directly modify, check the length, and access specific elements within the array.

  1. Create an array called cities with the following city names:

    • "Shanghai";

    • "Sydney";

    • "Toronto";

    • "Frankfurt".

  2. Modify the city name at index 2 to "Miami" directly within the array.

  3. Log the length of the cities array using console.log().

  4. Retrieve and log the last city name in the array using console.log().

// Task 1: Initial array
const cities = ___;

// Task 2: Modify a city name
cities___ = "Miami";

// Modified array
console.log(cities); // Output: Shanghai, Sydney, Miami, Frankfurt

// Task 3: Log array length
console.log("Array length:", ___); // Output: Array length: 4

// Task 4: Access and log the last city
console.log("Last city:", ___); // Output: Last city: Frankfurt


              
123456789101112131415

            
// Task 1: Initial array
const cities = ___;

// Task 2: Modify a city name
cities___ = "Miami";

// Modified array
console.log(cities); // Output: Shanghai, Sydney, Miami, Frankfurt

// Task 3: Log array length
console.log("Array length:", ___); // Output: Array length: 4

// Task 4: Access and log the last city
console.log("Last city:", ___); // Output: Last city: Frankfurt
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Expected Output:

python
Shanghai,Sydney,Miami,Frankfurt
Array length: 4
Last city: Frankfurt

  1. Use square brackets [] to create an array.

  2. Separate each element with the comma ,.

  3. Use console.log() to log the data.

  4. Use square brackets [] within the element index to access the element and change its value.

  5. Use the keyword length to get the array length.

// Task 1: Initial array
const cities = ["Shanghai", "Sydney", "Toronto", "Frankfurt"];

// Task 2: Modify a city name
cities[2] = "Miami";

// Modified array
console.log(cities); // Output: Shanghai, Sydney, Miami, Frankfurt

// Task 3: Log array length
console.log("Array length:", cities.length); // Output: Array length: 4

// Task 4: Access and log the last city
console.log("Last city:", cities[cities.length - 1]); // Output: Last city: Frankfurt

              
1234567891011121314

            
// Task 1: Initial array
const cities = ["Shanghai", "Sydney", "Toronto", "Frankfurt"];

// Task 2: Modify a city name
cities[2] = "Miami";

// Modified array
console.log(cities); // Output: Shanghai, Sydney, Miami, Frankfurt

// Task 3: Log array length
console.log("Array length:", cities.length); // Output: Array length: 4

// Task 4: Access and log the last city
console.log("Last city:", cities[cities.length - 1]); // Output: Last city: Frankfurt
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