JavaScript -Objektmethoden prüfen
Object.getOwnPropertyNames()
Clumsy Cobra
Object.getOwnPropertyNames() let members = Object.getOwnPropertyNames(foo)create()
keys()
values()
entries()
assign()
freeze()
seal()
getPrototypeOf()const student = {
id: 101,
major: "Mathamatics",
money: 5000,
name: "Abrar",
subjects: ["English", "Economics", "Math 101", "Calculus"],
bestFriend: {
name: "Kundu",
major: "Mathematics"
},
takeExam: function () {
console.log(this.name, "taking exam");
},
treatDey: function (expense, tip) {
this.money = this.money - expense - tip;
return this.money
}
}
student.takeExam();
//Output: Abrar taking exam
const remaining1 = student.treatDey(900, 100);
const remaining2 = student.treatDey(500, 50);
console.log(remaining1);
console.log(remaining2);
//Output: 4000,3450const person = {
name: 'Sam',
age: 30,
// using function as a value
greet: function() { console.log('hello') }
}
person.greet(); // hello//There are 2 main ways to create an Object in JavaScript
//The First Method:
let firstPlayer = new Object();
//You can add properties like this:
firstPlayer.name = 'Player 1';
firstPlayer.level = 3;
firstPlayer.inventory = ['a half-eaten cracker', 'some pocket lint', 'a flimsy tree branch'];
firstPlayer.description = 'Don\'t mention Player 2 around them, they\'ll get angry...';
//You can create methods like this:
firstPlayer.checkLevel = function() {
console.log(`${this.name} is currently... Level ${this.level}!`);
//The "this" keyword refers to the object
}
firstPlayer.checkLevel();
//This will print "Player 1 is currently... Level 3!" to the Console
//The Second Method:
let secondPlayer = {
//You can add properties like this:
name: 'Player 2',
level: 20,
inventory: ['a health potion', 'a sack of gold coins', 'a sturdy steel blade'],
description: 'Better than Player 1 in every way possible.',
//You can create methods like this:
checkLevel: function() {
console.log(`${this.name} is currently... Level ${this.level}!`);
//The "this" keyword refers to the object
}
}
secondPlayer.checkLevel();
//This will print "Player 2 is currently... Level 20!" to the Console
//And that's it! Decide what method you prefer and start making some Objects!