brackets and dots

braks-n-dots.js

// an example to learn about dots and brackets
// below are 6 test cases that work
// try writing some that break, find out what's happening

var og = {first: 'fifty', last: 'cent'};

var curtis = 'first';
var jackson = 'last';

console.log(og.first);
console.log(og.last);

console.log(og[curtis]);
console.log(og[jackson]);

console.log(og["first"]);
console.log(og["last"]);


// --------------------------------

var person = {
  name: 'John', 
  lastName: 'Smith', 
  age: 32,
  key: 0
};

for (let key in person){
  console.log(person[key]);
  console.log(key)
  console.log(person.key)
  console.log("--------")
}

for (let mike in person){
  console.log(person[mike]);
  console.log(mike)
  console.log(person.mike)
  console.log("--------")
}

// ----- objects vs arrays -----
// run in python tutor

function toObject(arr) {
  var rv = {};
  for (var i = 0; i < arr.length; ++i)
    if (arr[i] !== undefined) rv[i] = arr[i];
  delete rv[1]
  arr.splice(1, 1)
  return rv;
}

toObject(["a", "b", "c"])


// ---
// don't think about functions in objects just yet
// only string, numbers, ...
// ---

let obj = {
  p: "roperty",
  m: function ethod() {
    console.log(this.p)
  }
}

console.log(obj.p) // "roperty"
obj.m() // print "roperty"