Array HOFs

Array Higher-Order Functions

Method	Returns	Use
`map()`	New array	Transform
`filter()`	New array	Subset
`reduce()`	Single value	Aggregate
`find()`	First match	Search
`every()`	boolean	All match?
`some()`	boolean	Any match?

Example

const users=[
  {name:'Alice',age:25,active:true},
  {name:'Bob',age:17,active:false},
  {name:'Carol',age:30,active:true},
];
const names=users.map(u=>u.name);
const adults=users.filter(u=>u.age>=18);
const total=users.reduce((s,u)=>s+u.age,0);

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