Patterns with Objects

iterating over Object with for in loop

let myObj = { "one" : 1, "two" : 2, "three" : 3 };
let newArray = [];
for (let int in myObj){
  newArray.push( int * 5);
}
// newArray now contains: [5, 10, 15]

iterating over Objects with array methods

let myObj = { "one" : 1, "two" : 2, "three" : 3 };
let newArray = Object.keys(myObj).map( key => 5 * myObj[key] );
// newArray: [5, 10, 15];

cloning an object (shallow clone)

const clone = {...original}

immutably add another prop to original

const newobj = {...original, prop: newOne}

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