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