howtoclassprop

class MyClass {

    arr = [];

    constructor(width, height) {
        this.makeArray(width, height);
    }

    makeArray(width, height) {
        this.arr = new Array(width * height);
    }
}

class MyClass2 {

    arr = [];

    constructor(width, height) {
        this.width = width;
        this.height = height;
        this.makeArray();
    }

    makeArray() {
        this.arr = new Array(this.width * this.height);
    }
}

class MyClass3 {

    arr = [];

    constructor(width, height) {
        this.arr = this.makeArray(width, height);
    }

    makeArray(width, height) {
        return new Array(this.width * this.height);
    }
}