SOURCE

{
  let a = 1,
  b = 2;
  let es5 = {
    a: a,
    b: b
  }
  let es6 = {
    a,
    b
  }

  let es5_method = {
    hello: function() {

}
  }
  let es6_method = {
    hello() {

}
  }
} {
  let a = 'key_val';
  let b = {
    a: 'm'
  }
  console.log(b);
  let es6_b = [];
  es6_b.push(
    { [a] : 'm'}
  ) 
  console.log(es6_b);
}
{
  console.log(Object.is([],[]),[]===[]);
}
{
  let m = {
    a:'a',
    c:'c'
  }
  Object.assign(m,{b:'b'})
  console.log(m);
}
{
  let m = {
    a:'a1',
    c:'c1'
  }
  for(let [key,value] of Object.entries(m)){
    console.log(key);
  }
}
{
  let {a,b,...c} = {
    a:'test_a',
    b:'test_b',
    c:'test_c',
    d:'test_d'
  }
  console.log(c);
}