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Arrays and Objects
heroes = [
{name:"Batman",id:"Bruce Wayne",age:40,villains:["Penguin","Riddler","Joker"]},
{name:"Superman",id:"Clark Kent",age:35,villains:["Lex Luthor","Zod","Brainiac"]},
{name:"Wonder Woman",id:"Diana Prince",age:30,villains:["Cheetah","Apollo","Ares"]},
{name:"Iron Man",id:"Tony Stark",age:45,villains:["Thanos","Modoc","Titanium Man"]}
]
a.map(d => d*d)
heroes.map(d => d.name)
a.filter(d => d == 5)
heroes.filter(d => d.age < 40).map(d => d.name)
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