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Map
a = [4,6,8,1]
a.map(d => d*d)
heroes = [
{name:"Batman",id:"Bruce Wayne",villains:["Joker","Riddler","Penguin"]},
{name:"Superman",id:"Clark Kent",villains:["Lex Luthor","Brainiac","Zod"]},
{name:"Wonder Woman",id:"Diana Prince",villains:["Apollo","Ares","Cheetah"]},
{name:"Iron Man",id:"Tony Stark",villains:["Titanium Man","Thanos","Modoc"]}
]
heroes.map(d => d.name)
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