Currently, I have an array arr = [object1, object2, object3]. After removing the second index, the array now looks like arr = [object1, object3], and I am looking to add back the removed object2 at its original position in the array so that it becomes arr = [object1, object2, object3]. Can you please provide guidance on how to accomplish this task?
First, establish a temp variable to store the value of arr[object3], and proceed to delete it from the array. Afterwards, reintroduce both objects back into the array one at a time.
If you want to manipulate arrays in VanillaJS, Array.splice() is the way to go.
//Function syntax
Array.prototype.Splice = function([indexOfRemovedElement],[NumberOfElementsToRemove],<Any Object/Objects you want to add at the same position separated by commas>)
For example, let's say we have an array called arr:
var arr= [1,2,3,4,5];
If you need to remove and add elements at a specific index (let's say j), here's how you can do it:
var saved = arr[j]; //Save the element before removing
arr.splice(j, 1); //Remove the element
arr.splice(j, 0, saved); //Add the element back at the same index
Sample showcasing ES5 :
var object1 = {name:"object1"};
var object2 = {name:"object2"};
var object3 = {name:"object3"};
var arr = [object1, object2, object3];
var removedObj = arr.splice(1,1); // eliminated object2 from array.
console.log(arr); // [object1, object3]
var addRemovedObj = arr.splice(1,0,removedObj[0]);
console.log(arr); // [object1, object2, object3]Illustration using ES6 :
let object1 = {name:"object1"};
let object2 = {name:"object2"};
let object3 = {name:"object3"};
let arr = [object1, object2, object3];
let removedObj = arr.splice(1,1); // eliminated object2 from array.
console.log(arr); // [object1, object3]
arr = [object1, ...removedObj, object3];
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