I want to filter a large array list into multiple arrays for every 5 items in a certain way so that [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] would be [[1, 2, [3, 4, 5]], [6, 7, [8, 9, 10]]] or [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15] would be [[1, 2, [3, 4, 5]], [6, 7, [8, 9, 10]], [11, 12, [13, 14, 15]]]. (All arrays will be a multiple of 5 in my program.)
How would I do this?
Right now I'm doing this
for (var i = 1; i < (stoneTextureUnfiltered.length+1)/1.01; i++) {
stoneTexture.push([stoneTextureUnfiltered[i], stoneTextureUnfiltered[i+1], stoneTextureUnfiltered[i+2], [stoneTextureUnfiltered[i+3], stoneTextureUnfiltered[i+4], stoneTextureUnfiltered[i+5]]]);
}
but it doesn't seem to be working.
Thanks,
-Voxel
Assuming you've chunked the array already into parts of 5 with these answers and it's stored in a variable named chunks, to wrap the last 3 in each chunk you can use map:
const final = chunks.map((chunk) => [chunk[0], chunk[1], chunk.slice(2)]);
You add the first and second elements to the new list, then add the rest of the chunk as a whole.
Demo below:
// using second answer
var perChunk = 5 // items per chunk
var inputArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
var chunks = inputArray.reduce((resultArray, item, index) => {
const chunkIndex = Math.floor(index/perChunk)
if(!resultArray[chunkIndex]) {
resultArray[chunkIndex] = [] // start a new chunk
}
resultArray[chunkIndex].push(item)
return resultArray
}, [])
// answer below
const final = chunks.map((chunk) => [chunk[0], chunk[1], chunk.slice(2)]);
console.log(final);As you can see, it works nicely!