context

cleancalc-context.js

// pythontutor this code

var cleancalc = {

    lastResult: null,

    add: function (arg1, arg2) {
        return arg1 + arg2;
    },
    operate: function (operation, arg1, arg2) {
        if (arg2) {
            return this.lastResult = this[operation](arg1, arg2);
        } else {
            return this.lastResult = this[operation](arg1, this.lastResult);
        }
        return "oops"
    }
}

cleancalc.operate("add", 2, 3)
cleancalc.operate("add", 2)

context.js

let thissing = {
 variable: "inside",
 print: function() {
  console.log(variable);
  console.log(this.variable);
 }
}

let variable = "outside"

thissing.print()

// use pythontutor

greeter.js

let greeter = {
    english: 'Welcome',
    czech: 'Vitejte',
    danish: 'Velkomst',
    greet: function(language) {
        if (this[language] !== undefined) {
            console.log(this[language]);
        } else {
            console.log("XXX");
        }
    }
}

var errg = "english"
console.log(greeter[errg])
greeter.greet(errg)

sushi-roll.js

let sushiroll = {
 ingredients: {
     dolphin: true,
     rice: true,
     mayonaise: false
   },
 is_inhumane: function(ingredient) {
  if (this.ingredients[ingredient] != undefined) {
    return this.ingredients[ingredient];
  } else {
    return "does not contain this ingredient"
  }
 },
  bad_practice: function(ingredient) {
  if (sushiroll.ingredients[ingredient] != undefined) {
    return sushiroll.ingredients[ingredient];
  } else {
    return "does not contain this ingredient"
  }
 }
}

console.log(sushiroll.is_inhumane("dolphin"))
console.log(sushiroll.bad_practice("dolphin"))
console.log(sushiroll.is_inhumane("rice"))
console.log(sushiroll.is_inhumane("mayonaise"))