Testing this context on class instance methods

context-test.js

const c = (function () {
  this.context = 'lexical context';
  
  const bar1 = () => {
    console.log('bar 1:', this.context);
  };
  
  const curry = (fn) => {
    console.log('bar 3 curryer context:', this.context);
    return () => {
      console.log('bar 3:', this.context);
    };
  }

  return class Foo {
    constructor() {
      this.context = 'instance of class';
    }
    
    context = "static class";
    
    bar1 = bar1;
    
    bar2 = () => {
      console.log('bar 2:', this.context);
    };
    
    bar3 = curry();
    
    bar4 = ((fn) => {
      console.log('bar 4 curryer context:', this.context);
      return () => {
        console.log('bar 4:', this.context);
      };
    })();
  }
}).call({});

const d = new c();

console.log('Instantiated');

d.bar1();
d.bar2();
d.bar3();
d.bar4();

/**
 * OUTPUT:
 * bar 3 curryer context: lexical context
 * bar 4 curryer context: static class
 * Instantiated
 * bar 1: lexical context
 * bar 2: instance of class
 * bar 3: lexical context
 * bar 4: instance of class
 **/