Ways to eliminate a specific array from another array using JavaScript

0: {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500, …}
1: {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500, …}
2: {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500, …}

Is there a way to eliminate the 0:{} array within an array? Also, how can I retrieve the value of the first item?

javascriptarraysobject

Answer №1

It seems like you are looking to remove Array2 from Array1 based on the provided information,

Array1 = 0: {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500, …}
         1: {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500, …}
         2: {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500, …}

Array2 = 0: {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500, …}

If this is your requirement, you can achieve it using the filter function as shown below.

    var data = Array1; 
    var selectedRows = Array2; 

    var unSelectedRows = [];
    var unSelectedRows = data.filter( function( el ) {
      return !selectedRows.includes( el );
    } );

You will find the filtered elements in the unSelectedRows Array containing the 1st and 2nd element.

Answer №2

To remove the first element of an array, you can utilize the Array.prototype.shift method as shown below:

const array = [{
  id: 1553825061863,
  name: "Thai Milk Tea",
  qty: "1",
  total_amount: 9500,
  toppings: 500
}, {
  id: 1553825061863,
  name: "Thai Milk Tea",
  qty: "1",
  total_amount: 9500,
  toppings: 500
}, {
  id: 1553825061863,
  name: "Thai Milk Tea",
  qty: "1",
  total_amount: 9500,
  toppings: 500
)];

let remainingArray = array;
remainingArray.shift();

console.log(remainingArray);
.as-console-wrapper {
  max-height: 100% !important;
  top: auto;
}

Answer №3

//Give this a try in your console. Utilize the shift operator to move the first element.
//To also remove the last element, use pop
>>var myArr = [{id : 1, name: "A"}, {id: 2, name: "B"}, {id:3, name: "C"}];
undefined
>>myArr.shift(0);
{id: 1, name: "A"}
>>myArr
0: {id: 2, name: "B"}
1: {id: 3, name: "C"}

Check out this detailed link on Array.protoType.shift() which is used for removing the first element:

Answer №4

There are several methods you can use to achieve that.

Utilizing the shift() function

let arr = [{id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}, {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}, {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}]

arr.shift();
console.log(arr);

Note: The shift() method will alter the original array.

Using the splice() method

let arr = [{id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}, {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}, {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}]

arr.splice(0,1);
console.log(arr);

Note: Using the splice() function will also modify the original array.

Implementing slice Method

let arr = [{id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}, {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}, {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}]

let res = arr.slice(1)
console.log(res);

Employing Spread Operator And Destructuring Assignment

let arr = [{id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}, {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}, {id: 1553825061863, name: "Thai Milk Tea", qty: "1", total_amount: 9500, toppings: 500}]

const [,...rest] = arr
console.log(rest);

Answer №5

Here is a straightforward method to remove an index from an array:


var arr = ['apple', 'banana', 'cherry', 'date'];
arr.shift(); // returns "apple"
console.log( arr );

If you have an array like this one, and you want to delete the first index, use the following command:


var arr = [
            {  id: 123456789,  name: "John"}, 
            {  id: 987654321,  name: "Jane"},
            {  id: 246813579,  name: "Doe"}
            ];
  arr.shift();
console.log( arr );

Answer №6

In a collection of Javascript objects, deleting the first element can be done in multiple ways:

One method is to utilize the shift function like so:

var first = fruits.shift(); // removes the first item from the array

Another approach is to use the splice function, which allows for removal by index:

var removedItem = fruits.splice(pos, 1); // demonstrates how to remove an item

To access the value of a specific element based on its index:

var first = fruits[0];

To find the value of a particular field using the foreach function:

fruits.forEach(function(item, index, array) {
    if (item.id === 1553825061863) {
        console.log(item, index);
    }
});

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