Remove the 5th element from the given array, starting with the element at index 2

Question

Remove the 5th element from the given array, starting with the element at index 2

My array consists of 3 groups, with each group containing 5 elements.

var tempArray1 = ['prodn', 'PP1', 'UK1', 'Exp', 'India2', 'prodn', 'PP2', 'france1', 'Imp', 'Czech2', 'prodn', 'PP3', 'Germ1', 'Exp', 'Rom2']

I am looking to remove the 2nd element in my array and then delete every 5th element, which will eliminate all elements starting with "PP". It is important for me to remove these elements based on their position in the array, not by character type. The following code demonstrates how I plan to remove every 5th element:

var indexToRemove = 5;  // start position
var numberToRemove = 1; // elements to remove

tempArray1.splice(indexToRemove, numberToRemove);

However, I am unsure of how to initiate this process from the 2nd element. Any guidance would be appreciated. Thank you.

javascript arrays

Answer 1

Answer №1

When the splice method is used, it directly modifies the array (in-place). Therefore, when removing a value from the array, you should increment by 4 instead of 5 for subsequent steps. To implement this, initiate a for loop starting at index 1:

const tempArray1 = ['prodn', 'PP1', 'UK1', 'Exp', 'India2', 'prodn', 'PP2', 'france1', 'Imp', 'Czech2', 'prodn', 'PP3', 'Germ1', 'Exp', 'Rom2'];

for (let i = 1; i < tempArray1.length; i += 4) {
    tempArray1.splice(i, 1);
}

console.log(tempArray1);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 2

When the splice method is used, it directly modifies the array (in-place). Therefore, when removing a value from the array, you should increment by 4 instead of 5 for subsequent steps. To implement this, initiate a for loop starting at index 1:

const tempArray1 = ['prodn', 'PP1', 'UK1', 'Exp', 'India2', 'prodn', 'PP2', 'france1', 'Imp', 'Czech2', 'prodn', 'PP3', 'Germ1', 'Exp', 'Rom2'];

for (let i = 1; i < tempArray1.length; i += 4) {
    tempArray1.splice(i, 1);
}

console.log(tempArray1);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 3

Answer №2

    let elementsToRemove = ['prodn', 'PP1', 'UK1', 'Exp', 'India2', 'prodn', 'PP2', 'france1', 'Imp', 'Czech2', 'prodn', 'PP3', 'Germ1', 'Exp', 'Rom2']
    for(let i=2-1; i< elementsToRemove.length; i+=5-1){
        // start with 2nd element (-1 because arrays start at 0)
        // and then jump to 5th element (-1 because the one has just been removed)
        // remove 1 element at i-th place 
        elementsToRemove.splice(i,1);
    }

Answer 4

    let elementsToRemove = ['prodn', 'PP1', 'UK1', 'Exp', 'India2', 'prodn', 'PP2', 'france1', 'Imp', 'Czech2', 'prodn', 'PP3', 'Germ1', 'Exp', 'Rom2']
    for(let i=2-1; i< elementsToRemove.length; i+=5-1){
        // start with 2nd element (-1 because arrays start at 0)
        // and then jump to 5th element (-1 because the one has just been removed)
        // remove 1 element at i-th place 
        elementsToRemove.splice(i,1);
    }

Answer 5

Answer №3

let exampleArray = ['A1', 'B2', 'C3', 'D4', 'E5', 'F6', 'G7'];

const modifiedArray = exampleArray.filter((item, index) => {
    return (index % 3) != 0;
});

console.log(modifiedArray);

Answer 6

let exampleArray = ['A1', 'B2', 'C3', 'D4', 'E5', 'F6', 'G7'];

const modifiedArray = exampleArray.filter((item, index) => {
    return (index % 3) != 0;
});

console.log(modifiedArray);

Remove the 5th element from the given array, starting with the element at index 2

Answer №1

Answer №2

Answer №3

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