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Objects
heroes = [
{name:"Batman",id:{first:"Bruce",last:"Wayne"},age:45,villains:["Joker","Penguin","Riddler"]},
{name:"Superman",id:{first:"Clark",last:"Kent"},age:35,villains:["Lex Luther","Zod","Brainiac"]},
{name:"Wonder Woman",id:{first:"Diana",last:"Prince"},age:30,villains:["Cheetah","Apollo","Doctor Psycho"]},
{name:"Iron Man",id:{first:"Tony",last:"Stark"},age:40,villains:["Modoc","Crimson Dynamo","Thanos"]}
]
heroes.filter(d => d.age < 40)
heroes.map(d => d.name)
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