Revisions to How can I insert an item into an array at a specific index?

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edited Aug 13, 2021 at 14:15

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Another possible solution, with usage of Array#reduceArray.reduce.

const arr = ["apple", "orange", "raspberry"];
const arr2 = [1, 2, 4];

const insert = (arr, item, index) =>
  arr.reduce(function(s, a, i) {
    i === index ? s.push(item, a) : s.push(a);
    return s;
  }, []); 

console.log(insert(arr, "banana", 1));
console.log(insert(arr2, 3, 2))

Another possible solution, with usage of Array#reduce.

const arr = ["apple", "orange", "raspberry"];
const arr2 = [1, 2, 4];

const insert = (arr, item, index) =>
  arr.reduce(function(s, a, i) {
    i === index ? s.push(item, a) : s.push(a);
    return s;
  }, []); 

console.log(insert(arr, "banana", 1));
console.log(insert(arr2, 3, 2))

Another possible solution, with usage of Array.reduce.

const arr = ["apple", "orange", "raspberry"];
const arr2 = [1, 2, 4];

const insert = (arr, item, index) =>
  arr.reduce(function(s, a, i) {
    i === index ? s.push(item, a) : s.push(a);
    return s;
  }, []);

console.log(insert(arr, "banana", 1));
console.log(insert(arr2, 3, 2))

deleted 19 characters in body

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edited Jul 22, 2020 at 19:01

kind user

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Another possible solution, with usage of Array#reduce.

varconst arr = ["apple", "orange", "raspberry"],"raspberry"];
   const arr2 = [1, 2, 4];

functionconst insert = (arr, item, index) {=>
    arr = arr.reduce(function(s, a, i) {
      i ===== index ? s.push(item, a) : s.push(a);
      return s;
    }, []);   
     
console.log(arr);
}

insert(arr, "banana", 1));
console.log(insert(arr2, 3, 2);)

Another possible solution, with usage of Array#reduce.

var arr = ["apple", "orange", "raspberry"],
    arr2 = [1, 2, 4];

function insert(arr, item, index) {
    arr = arr.reduce(function(s, a, i) {
      i == index ? s.push(item, a) : s.push(a);
      return s;
    }, []);   
    console.log(arr);
}

insert(arr, "banana", 1);
insert(arr2, 3, 2);

Another possible solution, with usage of Array#reduce.

const arr = ["apple", "orange", "raspberry"];
const arr2 = [1, 2, 4];

const insert = (arr, item, index) =>
  arr.reduce(function(s, a, i) {
    i === index ? s.push(item, a) : s.push(a);
    return s;
  }, []); 
 
console.log(insert(arr, "banana", 1));
console.log(insert(arr2, 3, 2))

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answered Apr 5, 2017 at 17:06

kind user

reputation score 42006
8
8 gold badges
70
70 silver badges
78
78 bronze badges

Another possible solution, with usage of Array#reduce.

var arr = ["apple", "orange", "raspberry"],
    arr2 = [1, 2, 4];

function insert(arr, item, index) {
    arr = arr.reduce(function(s, a, i) {
      i == index ? s.push(item, a) : s.push(a);
      return s;
    }, []);   
    console.log(arr);
}

insert(arr, "banana", 1);
insert(arr2, 3, 2);

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