How to Enter multiple items in an array to another array at a specific index?

Question

I have an array

array1 = [1,2,3,6,7,8]

array2 = [40,50]

How can i push items in array2 to array1 to get a result

 result = [1,2,3,40,50,6,7,8];

keep in mind its not a simple concatination, need to insert the scecond array in specific index.

array1.splice(3, 0, array1 ); => splice doesnt accept another array.

How can i enter items in diffrent array to a specific index?

Im trying this in angular

array1 .splice(3, 0,...array2);

and getting the im getting spread array doesn't support in tslib

array1.splice(3, 0, ...array2); will do the job, although this will alter array1, so I'm assuming you want array1 to be result. Of course, I also assume that your environment supports the spread operator. — briosheje
– briosheje, Commented Jul 8, 2020 at 7:46
Following @briosheje's comment, I suggest you read about spread operators in general - they were introduced exactly to aid for these cases: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Moshe Jonathan Gordon Radian
– Moshe Jonathan Gordon Radian, Commented Jul 8, 2020 at 7:47
Do you want to alter array1 or do you want to create a new array that is the result of the concatenation? — ibrahim mahrir
– ibrahim mahrir, Commented Jul 8, 2020 at 7:49

Cagri Tacyildiz · Accepted Answer · 2020-07-08 07:52:39Z

1

var array1 = [1,2,3,6,7,8]

var array2 = [40,50]


function cobmine(arr1,arr2,index){
  var arr3=arr1.splice(0,index);
  var arr4=arr1.splice(-index);
  return arr3.concat(arr2).concat(arr4)
}

var result=cobmine(array1,array2,3);
console.log(result);

answered Jul 8, 2020 at 7:52

Cagri Tacyildiz

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Comments

Yury Tarabanko · Accepted Answer · 2020-07-08 08:04:06Z

1

Assuming your env does not support spread syntax for some reason you could stick to ES5 apply technique.

array1 = [1,2,3,6,7,8]

array2 = [40,50]

array1.splice.apply(array1, [3, 0].concat(array2))

console.log(JSON.stringify(array1))

answered Jul 8, 2020 at 8:04

Yury Tarabanko

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ZaidRehman · Accepted Answer · 2020-07-08 08:07:04Z

0

You can use below code to add array at a specific index

const arr1 = [1,2,3,6,7,8]
const arr2 = [40,50]
const index = 3

const newArr = [
    ...arr1.slice(0, index),
    ...arr2,
    ...arr1.slice(index + 1),
]
// [1,2,3,40,50,6,7,8]

answered Jul 8, 2020 at 8:07

ZaidRehman

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