Nov 2, 2014 · Try iterating through the elements of the persons object, update the element if a member with the same name exists, if it doesn't, push a new element to the array. Use a new variable exists to check if the member existed. Here is what you could do: var persons = { data: [] }; var bob = {name: 'Bob', age: 15}; var fill = {name: 'Fill', age: 20};

Nov 7, 2019 · const arrayOfBooks = [ {book: 1}, {book: 2}, {book: 3}, {book: 4}, ] const addBook = (list, book) => { list.push(book) } addBook(arrayOfBooks, {book: 5, isTheNewOne: true}) const result = arrayOfBooks console.log(result) // Array with 5 elements now See in fiddle

Dose your newer object item contains a id key? or do you mind having the id as well as all the properties from item object in the array entry? You can use findIndex to find the index in the array of the object and replace it as required: var item = {...} This assumes unique IDs.

The splice() method lets you insert new elements into an array while simultaneously deleting existing elements. To do this, you pass at least three arguments: the second argument specifies the number of items to delete, and the third argument indicates the element to insert.

Jun 16, 2023 · Manipulating JSON arrays in JavaScript is made easy with array destructuring for insertion, the filter method for deletion, and the map method with conditional statements for updating elements.

Feb 13, 2020 · In this tutorial we will create a Create, Read, Update, Delete (CRUD) using JavaScript. This code will add, delete, update and read a data table when the user open the program.

Arrays are mutable in JavaScript, but you should treat them as immutable when you store them in state. Just like with objects, when you want to update an array stored in state, you need to create a new one (or make a copy of an existing one), and then set state to use the new array.

Jun 23, 2023 · Discover easy techniques to update objects in arrays with JavaScript! Breakdown of methods, code snippets, and clear explanations for beginners and pros alike.

Mar 22, 2023 · The splice () method allows you to add or remove elements from an array. You can use it to replace an element by specifying the index, the number of elements to remove (which is 1 in this case), and the new element to add.

Jun 12, 2023 · By leveraging different techniques, such as iterating through the array, using Array.map(), or utilizing Array.findIndex(), you can efficiently update objects based on specific criteria or requirements.