In Javascript, I can add an element at a specific index in an array by inserting elements from a different

Question

In Javascript, I can add an element at a specific index in an array by inserting elements from a different

I am faced with a coding problem involving two separate Javascript arrays:

['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12']
['a', 'b', 'c']

The task at hand is to incorporate elements from the second array into specific positions within the first array, specifically every 4th or nth index instance, resulting in:

['a', '1', '2', '3', '4', 'b', '5', '6', '7', '8', 'c', '9', '10', '11', '12']

This parameter n must be adjustable, allowing for the placement of elements at different locations in the array as needed.

If you have any solutions, especially those utilizing ES6 functionality, please share them. Thank you for your help!

javascript arrays

Answer 1

Answer №1

To cycle through the smaller array, use the forEach method and implement splice() for element insertion.

let arr1 = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12']
let arr2 = ['a', 'b', 'c']

function addElements(arr1,arr2,n){
  arr1 = arr1.slice();
  arr2.forEach((element,index) => {
    arr1.splice(index*n+index,0,element);
  })
  return arr1;
}

console.log(addElements(arr1,arr2,4))

Answer 2

To cycle through the smaller array, use the forEach method and implement splice() for element insertion.

let arr1 = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12']
let arr2 = ['a', 'b', 'c']

function addElements(arr1,arr2,n){
  arr1 = arr1.slice();
  arr2.forEach((element,index) => {
    arr1.splice(index*n+index,0,element);
  })
  return arr1;
}

console.log(addElements(arr1,arr2,4))

Answer 3

Answer №2

Give this a shot

For each item in array b, insert it into array a at intervals based on the length of b.

Answer 4

Give this a shot

For each item in array b, insert it into array a at intervals based on the length of b.

Answer 5

Answer №3

Implement a forEach loop with an iterator as shown below:

let arr1 = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'];
let arr2 = ['a', 'b', 'c'];

let index = 0;
arr2.forEach(function(v){
  arr1.splice(index, 0, v);
  index += 5;
});

console.log(arr1);

Now in terms of ES6, here is the updated approach:

let arr1 = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'];
let arr2 = ['a', 'b', 'c'];

let index = 0;
Array.from(arr2).forEach((v)=> {
  arr1.splice(index, 0, v);
  index += 5;
});

console.log(arr1);

Answer 6

Implement a forEach loop with an iterator as shown below:

let arr1 = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'];
let arr2 = ['a', 'b', 'c'];

let index = 0;
arr2.forEach(function(v){
  arr1.splice(index, 0, v);
  index += 5;
});

console.log(arr1);

Now in terms of ES6, here is the updated approach:

let arr1 = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'];
let arr2 = ['a', 'b', 'c'];

let index = 0;
Array.from(arr2).forEach((v)=> {
  arr1.splice(index, 0, v);
  index += 5;
});

console.log(arr1);

Answer 7

Answer №4

Utilize the method Array.flatMap() to iterate through the second array, then extract the corresponding sequence from the first array using Array.slice(), and finally merge it with the current element utilizing spread operator. Employ Array.concat() combined with slice to append any remaining items if present.

const combineArrays = (size, additionalArr, primaryArr) => 
  additionalArr.flatMap((element, index) => [element, ...primaryArr.slice(size * index, size * (index + 1))])
  .concat(primaryArr.slice(size * additionalArr.length))

const mainArray = ['apple', 'banana', 'cherry', 'date', 'fig', 'grape', 'honeydew', 'kiwi', 'lemon', 'mango', 'nectarine', 'orange']
const secondaryArray = ['ant', 'bat', 'cat']

console.log(JSON.stringify(combineArrays(3, secondaryArray, mainArray)))
console.log(JSON.stringify(combineArrays(4, secondaryArray, mainArray)))
console.log(JSON.stringify(combineArrays(5, secondaryArray, mainArray))

Answer 8

Utilize the method Array.flatMap() to iterate through the second array, then extract the corresponding sequence from the first array using Array.slice(), and finally merge it with the current element utilizing spread operator. Employ Array.concat() combined with slice to append any remaining items if present.

const combineArrays = (size, additionalArr, primaryArr) => 
  additionalArr.flatMap((element, index) => [element, ...primaryArr.slice(size * index, size * (index + 1))])
  .concat(primaryArr.slice(size * additionalArr.length))

const mainArray = ['apple', 'banana', 'cherry', 'date', 'fig', 'grape', 'honeydew', 'kiwi', 'lemon', 'mango', 'nectarine', 'orange']
const secondaryArray = ['ant', 'bat', 'cat']

console.log(JSON.stringify(combineArrays(3, secondaryArray, mainArray)))
console.log(JSON.stringify(combineArrays(4, secondaryArray, mainArray)))
console.log(JSON.stringify(combineArrays(5, secondaryArray, mainArray))

In Javascript, I can add an element at a specific index in an array by inserting elements from a different

Answer №1

Answer №2

Answer №3

Answer №4

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