showing results for - "getters and setters javascript classes"
Joshua
04 Oct 2017
1// *** JS Class GETTER / SETTER (+split)
2
3	class Person {
4        constructor(firstname, lastname) {
5            this.firstname = firstname;
6            this.lastname = lastname;
7        }
8        // getters => access properties
9        // setters => change or mutate them
10        get fullName() {
11            return `Hello ${this.firstname} ${this.lastname}`;
12        }
13        set fullName(space) {
14            const parts = space.split(' ');
15            this.firstname = parts[0];
16            this.lastname = parts[1];
17        }
18    }
19    let run = document.getElementById("run");
20    run.addEventListener('click', () => {
21        let john = new Person('John', 'Connor');
22        console.log(john.fullName);
23        john.fullName = 'Billy Butcher';
24        console.log(john.firstname + ' ' + john.lastname);
25      	//console.log(`${john.firstname} ${john.lastname}`); same output
26      // => has to be john.firstname otherwise undefined 
27    }) 
28// output => Hello John Connor | Billy Butcher
Sara Sofía
28 Mar 2020
1let obj = {
2  log: ['a', 'b', 'c'],
3  get latest() {
4    if (this.log.length === 0) {
5      return undefined;
6    }
7    return this.log[this.log.length - 1];
8  }
9};
10
11obj.log.push('d');
12console.log(obj.latest); //output: 'd'
Maximilien
17 Oct 2018
1/*Getter functions are meant to simply return (get) the value of an object's 
2private variable to the user without the user directly accessing the private 
3variable.*/
4/*Setter functions are meant to modify (set) the value of an object's private 
5variable based on the value passed into the setter function. This change could
6involve calculations, or even overwriting the previous value completely.*/
7class Book {
8  constructor(author) {
9    this._author = author;
10  }
11  // getter
12  get writer() {
13    return this._author;
14  }
15  // setter
16  set writer(updatedAuthor) {
17    this._author = updatedAuthor;
18  }
19}
20const novel = new Book('anonymous');
21console.log(novel.writer);  // anonymous
22novel.writer = 'newAuthor';
23console.log(novel.writer);  // newAuthor
Simone
20 Sep 2016
1// ES6 get and set
2class Person {
3  constructor(name) {
4    this._name = name;
5  }
6
7  get name() {
8    return this._name.toUpperCase();
9  }
10
11  set name(newName) {
12    this._name = newName; // validation could be checked here such as only allowing non numerical values
13  }
14
15  walk() {
16    console.log(this._name + ' is walking.');
17  }
18}
19
20let bob = new Person('Bob');
21console.log(bob.name); // Outputs 'BOB'
Vincenzo
01 Aug 2020
11) Syntax reasons. It’s easier and faster to read code 
2created with accessor functions
32) Encapsulation. I can create safer code with accessor functions.
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