Comparing the different ways of defining a method in TypeScript and their effect on `this`

example.ts

class SomeClass {
    public a;
    public b;
    constructor() {
        this.a = '1';
        this.b = []
    }
    one = () => {
        console.log(`one = () => {}  ${this.a}`)
        this.b.push('one')
    }


    two() {
        console.log(`two() {}  ${this.a}`)
        this.b.push('two')
    }

    three = function () {
        console.log(`three =  funciton() {}  ${this.a}`)
        this.b.push('three')
    }
}

let someClassObj = new SomeClass();
someClassObj.one()
someClassObj.two()
someClassObj.three()
console.log(someClassObj.b)

// Outputs
// one = () => {}  1
// public two() {}  1
// three =  funciton() {}  1
// ["one", "two", "three"]