Example 1: javascript insert item into array
var colors=["red","blue"];
var index=1;
//insert "white" at index 1
colors.splice(index, 0, "white"); //colors = ["red", "white", "blue"]
Example 2: append array js
var colors= ["red","blue"];
colors.push("yellow"); //["red","blue","yellow"]
Example 3: insert into array js
// for me lol... pls don't delete!
// use splice to insert element
// arr.splice(index, numItemsToDelete, item);
var list = ["hello", "world"];
list.splice( 1, 0, "bye");
//result
["hello", "bye", "world"]
Example 4: add element to array using splice
//we can add elements to array using splice
const strings=['a','b','c','d']
//go the 2nd index,remove 0 elements and then add 'alien' to it
strings.splice(2,0,'alien')
console.log(strings) //["a", "b", "alien", "c", "d"]
//what is the time complexity ???
//worst case is O(n). if we are adding to end of array then O(1)
//in our example we added to the middle of array so O(n/2)=>O(n)
Example 5: array insertion javascript
Array.prototype.insert = function ( index, item ) {
this.splice( index, 0, item );
};
Example 6: add elements to an array with splice
var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("demo").innerHTML = fruits;
function myFunction() {
fruits.splice(2, 0, "Lemon", "Kiwi");
document.getElementById("demo").innerHTML = fruits;
}