Constructors

A constructor is a special Polylang function which is used to create a new record of a contract. For the specific signature of the constructor, refer to the simplified grammar.

For example, suppose we have the following contract:

contract Person {
    id: string;
    name: string;
    age: number;
 
    constructor (id: string, name; string, age: number) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
}

The constructor in this case has the following fields: id, name, and age, which map to the fields of the contract. When a new record of the Person contract is created, the constructor is invoked, passed these values, and the fields for this record are updated with these values.

The constructor can take fewer arguments than the number of fields in the contract:

contract Person {
    id: string;
    name: string;
    age: number;
 
    constructor (id: string, name; string) {
        this.id = id;
        this.name = name;
        this.age = 0; // initialize explicitly
    }
}