Transfer the contents of one array into the center of another array using JavaScript

Question

Transfer the contents of one array into the center of another array using JavaScript

I have been looking for answers here, but I can only find solutions for different programming languages.

Currently, I am dealing with 2 Uint8 typed arrays.

var arr1 = [0,0,0];
var arr2 = [0,1,2,3,4,5,6,7,8,9];

My goal is to replace the contents of arr2 with arr1, starting at the 4th position. This means arr2 should look like this:

arr2 = [0,1,2,0,0,0,6,7,8,9];

If I was not trying to do this in the middle of the array, I could easily use set as shown here:

arr2.set(arr1);

This would give me the following result:

arr2 = [0,0,0,4,5,6,7,8,9];

Although I know that looping through arr2 and copying values individually can achieve the desired outcome, it is incredibly slow compared to using set (and performance is crucial because I am copying an entire array of canvas image data 24 times per second).

Is there a function available that can copy into the middle of an array with the same efficiency as set?

javascript arrays

Answer 1

Answer №1

Implement the typedarray.set(array[, offset]) method to set values with an offset.

offset Additional Parameter

The designated position in the target array to start writing values from the source array. If not specified, defaults to 0 (meaning overwriting starts at index 0).

const arr1 = new Uint8Array([0,0,0]);
const arr2 = new Uint8Array([0,1,2,3,4,5,6,7,8,9]);

arr2.set(arr1, 4);

console.log(arr2);

Answer 2

Implement the typedarray.set(array[, offset]) method to set values with an offset.

offset Additional Parameter

The designated position in the target array to start writing values from the source array. If not specified, defaults to 0 (meaning overwriting starts at index 0).

const arr1 = new Uint8Array([0,0,0]);
const arr2 = new Uint8Array([0,1,2,3,4,5,6,7,8,9]);

arr2.set(arr1, 4);

console.log(arr2);

Answer 3

Answer №2

To implement this functionality, utilize the slice method along with the spread syntax:

const combineArrays = (sourceArr, index, targetArr) => [
  ...sourceArr.slice(0, index),
  ...targetArr,
  ...sourceArr.slice(index)
]

var array1 = [0,0,0];
var array2 = [0,1,2,3,4,5,6,7,8,9];

const mergedArray = combineArrays(array2, 3, array1);
console.log(mergedArray);

The usage of .slice ensures that the original array remains unaltered as it returns a new shallow copy, unlike splice.

Answer 4

To implement this functionality, utilize the slice method along with the spread syntax:

const combineArrays = (sourceArr, index, targetArr) => [
  ...sourceArr.slice(0, index),
  ...targetArr,
  ...sourceArr.slice(index)
]

var array1 = [0,0,0];
var array2 = [0,1,2,3,4,5,6,7,8,9];

const mergedArray = combineArrays(array2, 3, array1);
console.log(mergedArray);

The usage of .slice ensures that the original array remains unaltered as it returns a new shallow copy, unlike splice.

Answer 5

Answer №3

Have you considered utilizing the offset parameter in the set method when working with typed arrays?

arr2.set(arr1, 3)

This will allow you to start overwriting from the 4th element of the target array. More information here.

It appears that this functionality aligns well with your requirements, assuming I've interpreted your question correctly.

Answer 6

Have you considered utilizing the offset parameter in the set method when working with typed arrays?

arr2.set(arr1, 3)

This will allow you to start overwriting from the 4th element of the target array. More information here.

It appears that this functionality aligns well with your requirements, assuming I've interpreted your question correctly.

Transfer the contents of one array into the center of another array using JavaScript

Answer №1

Answer №2

Answer №3

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