Question

Remove the last two elements, then add a 3 and a 9 to the end of the array. Do not output to the console.

in javascript

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let userArray = [4, 2, 8, 5, 0, 1, 6]; // Tests may use different array values let length=userArray.length-1; //Removing last element from array if(length>-1) { userArray.splice(length,1); } length=userArray.length-1; //removing last element from array if(length>-2); { userArray.splice(length,1); } //adding 3 into array userArray.push(3); //adding 9 into array

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Testing the final value of userArray when the initial array is [4, 2, 8, 5, 0, 1, 6]
Yours and expected differ. See highlights below.
Special character legend
Yours
4,2,8,5,0,3,9
4,2,8,5,0,3,9
Expected
4,2,8,5,0,3,9
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Testing the final value of userArray when the initial array is [-5, 3]
Yours and expected differ. See highlights below.
Special character legend
Yours
3,9
3,9
Expected
3,9

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Answer 1

To remove the last two elements from the array and then add a 3 and a 9, use the splice() method with -2 to remove the elements, followed by the push() method to add the new ones.

Step-by-step explanation:

To modify an array in JavaScript, such as removing the last two elements and then adding new elements to the end, we can use methods like splice() and push(). However, your code contains a small mistake that prevents it from working correctly when the array has less than two elements.

To correctly remove the last two elements in any given array and then add a 3 and a 9, you can do the following:

let userArray = [4, 2, 8, 5, 0, 1, 6]; // This is just an example
// Remove the last two elements
userArray.splice(-2);
// Add 3 and 9 to the end of the array
userArray.push(3, 9);

This code first uses splice() with -2 to remove the last two elements regardless of the array's size, then push() adds the 3 and the 9 to the end of the array.