What is the method for adding an item to an array in JavaScript?

actions = [{ 'name' : 'Share',
  'icon' : 'fa fa-share-alt library_icon mylibrary-icon-right'
    },{
    'name' : 'Edit',
    'icon' : 'fa fa-pencil-square-o library_icon mylibrary-icon-right'
  },
  {
    'name' : 'Embed',
    'icon' : 'fa fa-link library_icon mylibrary-icon-right'
  },
  {
     'name' : 'Schedule',
     'icon' : 'fa fa-calendar library_icon mylibrary-icon-right'
  }
];

Is there a method to remove the second object from the actions array, apply a condition, and then insert it back at the same position?

javascriptarraystypescriptobject

Answer №1

Perhaps you are interested in using the splice method, which can delete a specified number of elements from an array and insert new elements at a specific index.

const actions = [
  { 'name' : 'Share', 'icon' : 'fa fa-share-alt library_icon mylibrary-icon-right'},
  {
    'name' : 'Edit',
    'icon' : 'fa fa-pencil-square-o library_icon mylibrary-icon-right'
  },
  {
    'name' : 'Embed',
    'icon' : 'fa fa-link library_icon mylibrary-icon-right'
  },
  {
     'name' : 'Schedule',
     'icon' : 'fa fa-calendar library_icon mylibrary-icon-right'
  }
];


const saved = actions.splice(1,1); // Remove 1 element at index 1
console.log("Test1", actions);
console.log("Removed", saved);
actions.splice(1,0,...saved); // Remove 0 elements at index 1 and insert saved elements
console.log("Test2", actions);

If you are using this for a menu, another approach could be to store the original array and use the filter method to create a new array based on a condition, discarding the filtered array when no longer needed.

const actions = [
  { 'name' : 'Share', 'icon' : 'fa fa-share-alt library_icon mylibrary-icon-right'},
  {
    'name' : 'Edit',
    'icon' : 'fa fa-pencil-square-o library_icon mylibrary-icon-right'
  },
  {
    'name' : 'Embed',
    'icon' : 'fa fa-link library_icon mylibrary-icon-right'
  },
  {
     'name' : 'Schedule',
     'icon' : 'fa fa-calendar library_icon mylibrary-icon-right'
  }
];


const filtered = actions.filter( item => item.name != "Edit");
console.log("Filtered", filtered);

Answer №2

Simply replace the element (starting from index 0) with a new object

const actions = [{ 'name' : 'Share', 'icon' : 'fa fa-share-alt library_icon mylibrary-icon-right' },{ 'name' : 'Edit', 'icon' : 'fa fa-pencil-square-o library_icon mylibrary-icon-right' },{ 'name' : 'Embed', 'icon' : 'fa fa-link library_icon mylibrary-icon-right' },{ 'name' : 'Schedule', 'icon' : 'fa fa-calendar library_icon mylibrary-icon-right' }];

function replaceElement(index, newObj){
  const array = actions;
  array[index] = newObj;
  return array;
}

console.log(replaceElement(2, {new:'one'}));

Answer №3

One way to manipulate arrays in JavaScript is by using the splice() method. If you want to remove an element at position 1, you can do so with the following code:

actions.splice(1,1);

If you want to add an item at position 1, you can use the following code:

actions.splice(1,0,itemToAdd);

Answer №4

If you want to delete an object at a specific index, keep that index and later add an object at the same index, here's how you can do it. Learn more about splice.

var action = [{ 'name' : 'Share',
  'icon' : 'fa fa-share-alt library_icon mylibrary-icon-right'
    },{
    'name' : 'Edit',
    'icon' : 'fa fa-pencil-square-o library_icon mylibrary-icon-right'
  },
  {
    'name' : 'Embed',
    'icon' : 'fa fa-link library_icon mylibrary-icon-right'
  },
  {
     'name' : 'Schedule',
     'icon' : 'fa fa-calendar library_icon mylibrary-icon-right'
  }
];
var idx = -1;
var item = {"foo":"bar"};
// First, remove the element that matches a specific condition
action.forEach(function (el,index){
  if("Edit" == el.name ){
    action.splice(index,1);
    idx=index;
    item = el;
    return ;
   }
})
console.log(`items before addition `,action);
// Step 2 is inserting the element back at the deleted index
action.splice(idx, 0, item)

console.log(`items after addition `,action);

Answer №5

To include an item in an array, you can utilize the push method.

For instance: 

const items = [{
    'name': 'Book',
    'icon': 'fa fa-book library_icon mylibrary-icon-right'
  }, {
    'name': 'Music',
    'icon': 'fa fa-music library_icon mylibrary-icon-right'
  },
  {
    'name': 'Film',
    'icon': 'fa fa-film library_icon mylibrary-icon-right'
  },
  {
    'name': 'Art',
    'icon': 'fa fa-paint-brush library_icon mylibrary-icon-right'
  }
];

var newItem = {
  name: 'Guitar',
  icon: 'musical instrument'
}

items.push(newItem)

console.log(items)

If you wish to delete the second item and then place it at the end, you can achieve this using filter or splice:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

const items = [{
    'name': 'Book',
    'icon': 'fa fa-book library_icon mylibrary-icon-right'
  }, {
    'name': 'Music',
    'icon': 'fa fa-music library_icon mylibrary-icon-right'
  },
  {
    'name': 'Film',
    'icon': 'fa fa-film library_icon mylibrary-icon-right'
  },
  {
    'name': 'Art',
    'icon': 'fa fa-paint-brush library_icon mylibrary-icon-right'
  }
];

var secondItem = items[1]
items.push(secondItem) // adds secondItem to end of array
items.splice(1, 1) // removes one element from index 1

console.log(items)

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