Как передавать переменные между методами класса Javascript?

Question

[HarisonX]

class Task {
    constructor(document_number) { this.document_number = document_number; }
    getOperations() {
    // Шаг №1
    console.log("Your input: " + this.document_number);

    // Шаг №2
    if (this.document_number % 2 == 0) {
        let operation_1 = "+";
        console.log("Operation №1: " + operation_1);
    } else if (this.document_number % 2 == 1) {
        let operation_1 = "-";
        console.log("Operation №1: " + operation_1);
    };

    // Шаг №3
    const c = this.document_number % 3;
    console.log("Const C: " + c);

    // Шаг №4
    if (this.document_number % 5 == 0) {
        let operation_2 = "*";
        console.log("Operation №2: " + operation_2);  
    } else if (this.document_number % 5 == 1) {
        let operation_2 = "/";
        console.log("Operation №2: " + operation_2);
    } else if (this.document_number % 5 == 2) {
        let operation_2 = "%";
        console.log("Operation №2: " + operation_2);
    } else if (this.document_number % 5 == 3) {
        let operation_2 = "+";
        console.log("Operation №2: " + operation_2);
    } else if (this.document_number % 5 == 4) {
        let operation_2 = "-";
        console.log("Operation №2: " + operation_2);
    }

    // Шаг №5
    if (this.document_number % 7 == 0) {
        let i_j_index = "byte";
        console.log("I/J index: " + i_j_index);
    } else if (this.document_number % 7 == 1) {
        let i_j_index = "short";
        console.log("I/J index: " + i_j_index);
    } else if (this.document_number % 7 == 2) {
        let i_j_index = "int";
        console.log("I/J index: " + i_j_index);
    } else if (this.document_number % 7 == 3) {
        let i_j_index = "long";
        console.log("I/J index: " + i_j_index);
    } else if (this.document_number % 7 == 4) {
        let i_j_index = "char";
        console.log("I/J index: " + i_j_index);
    } else if (this.document_number % 7 == 5) {
        let i_j_index = "float";
        console.log("I/J index: " + i_j_index);
    } else if (this.document_number % 7 == 6) {
        let i_j_index = "double";
        console.log("I/J index: " + i_j_index);
    }
    }

    calculate() {
        console.log("ТУТ ДОЛЖНЫ БЫТЬ ПЕРЕМЕННЫЕ ИЗ МЕТОДА getOperations()");
    }
}

task = new Task(1418);
task.getOperations();
task.calculate();

Вот собственно.

Comments

[snake2]

constructor(document_number) { 
    this.document_number = document_number;
    this.operation_1 = ''; 
}

getOperations() {
    if (this.document_number % 2 == 0) {
        this.operation_1 = "+";
    }

calculate() {
        console.log(this.operation);
    }