I am looking to create a skip pattern that can be applied to an array. The goal is to select the starting point of the pattern within the array and then return the items based on that pattern.
For instance, if I want to skip 2 2 1 2 in the array arr = [1,2,3,4,5,6,7,8,9], starting from the second item (2), it should return [2,4,6,7,9]. Does anyone have insight into how this can be achieved using JavaScript?
Give it a shot
let testArray = [1,2,3,4,5,6,7,8,9];
let jumpPattern = [2,2,1,2];
console.log(sliceArray(testArray, jumpPattern));
function sliceArray(arr, pattern){
for(let i = 0; pattern.length > i; i++)
arr.splice(i, pattern[i] - 1);
return arr;
}
In the world of arrays, it is common for them to be zero-indexed. Therefore, stating that the start index is two may seem a bit strange since it actually corresponds to the third element in the array. However, you can use a function like the one provided below to get yourself started.
function extractElements (start, pattern, arr)
{
let currentIndex = 0,
resultArray = [ ];
pattern.unshift (start == 0 ? start : start - 1); // This tweak is made to handle the situation where the first index in the array is considered as the second element. If that's not needed, simply use pattern.unshift(start);
for (let value of pattern) {
currentIndex += value;
resultArray.push(arr[currentIndex]);
}
return resultArray;
}
The above code will produce:
=> extractElements(2, [2, 2, 1, 2], [1, 2, 3, 4, 5, 6, 7, 8, 9]);
[2, 4, 6, 7, 9]
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