I'm getting an array handed to me that has elements in increments of 5; the 3rd and 4th elements of which i need to drop.
I've got a working solution in two separate for-loops, but I feel like there's gotta be a better or more concise way of doing this...any thoughts?
const arr = ["good","good","bad","bad","good","good","good","bad","bad","good",];
// remove every 3rd of 5 elements
for (let i = 2; i <= arr.length; i += 4) {
arr.splice(i, 1);
}
// remove every 3rd of 4 elements
for (let i = 2; i <= arr.length; i += 3) {
arr.splice(i, 1);
}
console.log(arr)
// expected output ["good","good","good","good","good","good"]
You could just do it in a single loop by removing 2 elements, instead of 1.
const arr = Array(50).fill(["good", "good", "bad", "bad", "good"]).flat()
// remove every 3rd of 5 elements
for (let i = 2; i <= arr.length; i += 3) {
arr.splice(i, 2);
}
console.log(arr);If creating a new array is acceptable, I would go the following way:
const array = ["good", "good", "bad", "bad", "good", "good", "good", "bad", "bad", "good", ];
var result = [];
const disallowedIndices = [2, 3];
for (let i = 0; i < array.length; i++) {
const normalizedIndex = i % 5;
if (!disallowedIndices.includes(normalizedIndex)) {
result.push(array[i]);
}
}
console.log(result);or if you want to make it a little bit more fancy:
const array = ["good","good","bad","bad","good","good","good","bad","bad","good",];
var reduceFunction = (filteredArray, currentElement, index) => {
const normalizedIndex = index % 5;
const disallowedIndices = [2, 3];
if (!disallowedIndices.includes(normalizedIndex))
{
filteredArray.push(currentElement);
}
return filteredArray;
}
var result = array.reduce(reduceFunction, []);
console.log(result);It makes the solution more versatile allowing the filtering parameters to be easily modified in the future.
You can use the Array filter prototype to filter out 3 & 4 index
const arr = Array(50).fill(["good", "good", "bad", "bad", "good"]).flat()
const disAllowedIndex=[2,3]
const filteredArray=arr.filter((item,index)=>!disAllowedIndex.some(i=>i==index%5))