How to remove specific elements from the left of a given array of elements using JavaScript ?

In this article, we will learn How to remove specific elements from the left of a given array of elements using JavaScript. We have given an array of elements, and we have to remove specific elements from the left of a given array.

Here are some common approaches:

Approach: Using splice() method

The splice() method is used to add and remove elements from an array. To remove specific elements from the left of a given array, we will use the splice method. To remove specific elements it takes two parameters index form where we want to remove the element and the number of the elements we want to remove. It returns an array that contains removed elements. 

Syntax:

array.splice(index,No_of_element);

Example: In this example, we will remove specific elements from the left of a given array of elements using JavaScript using the splice() method.

function fun(n) {
    // Array
    var arr = [2, 4, 5, 3, 6];
    
    // Find index of specified element which is n
    var ind = arr.indexOf(n);
    
    // Remove n from array if it exists
    if (ind !== -1) {
        arr.splice(ind, 1);
    }
    
    // Log the results to the console
    console.log("After removing element:");
    console.log(arr);
}

// Call the function with the specified element to remove
fun(5);

After removing element:
[ 2, 4, 3, 6 ]

Using shift Method

The shift method removes the first element from an array and returns that element. This method modifies the original array directly, reducing its length by one. It's a simple and effective way to remove an element from the start of an array.

Example: In this example we removes the first element from array using shift(), which modifies the array and returns the removed element. It then logs the updated array and the removedElement to the console.

let array = [1, 2, 3, 4, 5];
let removedElement = array.shift();

console.log(array); 
console.log(removedElement); // 1

[ 2, 3, 4, 5 ]
1