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JavaScript - object constructors
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In this article, we would like to show you how to use object constructors in JavaScript.
Quick solution:
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function User(id, name, age) {2
this.id = id;3
this.name = name;4
this.age = age;5
}6
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const user = new User(1, 'Tom', 23);Note:
The constructor functions schould be named with a capital first letter.
In this section, we create use two different ways to use a constructor.
To create user object, we need to call the constructor function with the new keyword.
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// create constructor2
function User(id, name, age) {3
this.id = id;4
this.name = name;5
this.age = age;6
}7
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// usage example9
const user1 = new User(1, 'Tom', 23);10
const user2 = new User(2, 'Kate', 25);11
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console.log(JSON.stringify(user1)); // {"id":1,"name":"Tom","age":23}13
console.log(JSON.stringify(user2)); // {"id":2,"name":"Kate","age":25}ES6 intorduces class keyword.
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class User {2
constructor(id, name, age) {3
this.id = id;4
this.name = name;5
this.age = age;6
}7
}8
9
const user1 = new User(1, 'Tom', 23);10
const user2 = new User(2, 'Kate', 25);11
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console.log(JSON.stringify(user1)); // {"id":1,"name":"Tom","age":23}13
console.log(JSON.stringify(user2)); // {"id":2,"name":"Kate","age":25}
