prototype chain

prototype_chain_examples.js

var mufasa = {
  name: "Mufasa",
  sing() {
    var inner = function() {
        console.log("inner:this", this);
    };
    var innerStrict = function() {
        'use strict';
        console.log("innerStrict:this", this);
    };
    var innerArrow = ()=>console.log("innerArrow:this", this)
    var innerArrowStrict = ()=>{
        'use strict'; // doesn't matter in an arrow function
        console.log("innerArrowStrict:this", this);
    }
    console.log("sing", this);
    inner();
    innerStrict();
    innerArrow();
    innerArrowStrict();
  }
};
var simba = {name:'Simba'};
console.log('\nmufasa.sing(); ... calling sing in the context of mufasa')
mufasa.sing();
console.log('\nmufasa.sing.call(simba); ... calling sing in the context of simba')
mufasa.sing.call(simba);
console.log('\nsimba.sing=mufasa.sing;simba.sing(); ... assigning sing to a different context')
simba.sing=mufasa.sing;simba.sing();