How to push to an array in a particular position?

To push any item at specific index in array use following syntax

// The original array
var array = ["one", "two", "four"];
// splice(position, numberOfItemsToRemove, item)
array.splice(2, 0, "three");

console.log(array);  // ["one", "two", "three", "four"]

array = [4,5,9,6,2,5]

#push 0 to position 1
array.splice(1,0,0)

array = [4,0,5,9,6,2,5]

#push 123 to position 1
array.splice(1,0,123)

array = [4,123,0,5,9,6,2,5]

The splice() function is the only native array function that lets you add elements to the specific place of an array

I will get a one array that you entered in your question to describe

splice(position, numberOfItemsToRemove, item)

• position = What is the position that you want to add new item
• numberOfItemsToRemove = This indicate how many number of items will deleted. That's mean delete will start according to the position that new item add.

Ex = if you want to add 1 position to 123 result will be like this ([4,123,0,5,9,6,2,5]) but if you give numberOfItemsToRemove to 1 it will remove first element after the 123 if you give 2 then its delete two element after 123.

• item = the new item that you add

function my_func(){
        var suits = [4,0,5,9,6,2,5]
        
        suits.splice(1 , 0 , 123);

        document.getElementById('demo').innerHTML = suits;
}

<p id="demo">4,0,5,9,6,2,5</p>
<button id="btn01" onclick="my_func()">Splice Array</button>