インスタンス変数.定義

Python

py

class Class01:
    def __init__(self, member01):
        self.member01 = member01

PHP

php

class Class01 {
    public $member01 = 3;
}

TypeScript

ts

class Class01 {
    public member01: number = 3;
}

Ruby

rb

class Class01
    @member01 = 3
end