var array1= ['S', 'T', 'A', 'C', 'K', 'O', 'V', 'E', 'R', 'F', 'L', 'O', 'W'];

// At position 3, delete 7 and add 7 elements: 

array1.splice(3, 7, "X","X","X","X","X","X","X");

​

console.log(array1);

let arr = ['foo', 'bar', 10, 'qux'];

​

// arr.splice(<index>, <steps>, [elements ...]);

​

arr.splice(1, 1);           // Removes 1 item at index 1

// => ['foo', 10, 'qux']

​

arr.splice(2, 1, 'tmp');    // Replaces 1 item at index 2 with 'tmp'

// => ['foo', 10, 'tmp']

​

arr.splice(0, 1, 'x', 'y'); // Inserts 'x' and 'y' replacing 1 item at index 0

// => ['x', 'y', 10, 'tmp']

const months = ['Jan', 'March', 'April', 'June'];

months.splice(1, 0, 'Feb');

// inserts at index 1

console.log(months);

// expected output: Array ["Jan", "Feb", "March", "April", "June"]

​

months.splice(4, 1, 'May');

// replaces 1 element at index 4

console.log(months);

// expected output: Array ["Jan", "Feb", "March", "April", "May"]

​

months.splice(0, 1);

// removes 1 element at index 0

console.log(months);

// expected output: Array ["Feb", "March", "April", "May"]

The splice() method adds and/or removes array elements.

The splice() method overwrites the original array.

array.splice(index, howmany to remove, item1, ....., itemX)

const fruits = ["Banana", "Orange", "Apple", "Mango"];

fruits.splice(2, 1, "Lemon", "Kiwi");

//Banana,Orange,Lemon,Kiwi,Mango

/*splice(start)

splice(start, deleteCount)

splice(start, deleteCount, replaceitem1)

splice(start, deleteCount, replaceitem1, ""2, ""N) */

​

​

//examples

const months = ['Jan', 'March', 'April', 'June'];

months.splice(1, 0, 'Feb');

// inserts at index 1

console.log(months);

// expected output: Array ["Jan", "Feb", "March", "April", "June"]

​

months.splice(4, 1, 'May');

// replaces 1 element at index 4

console.log(months);

// expected output: Array ["Jan", "Feb", "March", "April", "May"]

​

​

​

// The splice() method can be used to add new items to an array:

const fruits = ["Banana", "Orange", "Apple", "Mango"];

fruits.splice(2, 0, "Lemon", "Kiwi");

 // >> ["Banana", "Orange", "Lemon", "Kiwi", "Apple", "Mango"]

​

//if you find this answer is useful ,

//upvote ⇑⇑ , so can the others benefit also . @mohammad alshraideh ( ͡~ ͜ʖ ͡°)

    let fruits = ["apple", "pear", "plum", "orange", "cherry"];

    fruits.splice(1, 0, 'watermelon');

    console.log(fruits);

    fruits.splice(1, 1);

    console.log(fruits)

    /*

[ 'apple', 'watermelon', 'pear', 'plum', 'orange', 'cherry' ]

[ 'apple', 'pear', 'plum', 'orange', 'cherry' ]

    */

const arrayToBeFixed = ['a', 'b', 'wrong', 'f']

​

const removedElements = arrayToBeFixed.splice(2, // Where to insert

1, // number of elements to be removed from arrayToBeFixed

'c', 'd', 'e', // elements to add starting from the insertion index 

);

​

console.log(arrayToBeFixed) // ['a' 'b', 'c', 'd', 'e', 'f']

console.log(removedElements) // ['wrong']

//Splice

const numbers = [3, 6, 4, 8, 9, 19, 15, 21, 45, 87];

const numberSplice = numbers.splice(0, 3);

console.log(numberSplice);

//Output: [ 3, 6, 4 ]