map

most important function

• it will return a value from function

let numbers = [1, 2, 3, 4];

let numbers2 = numbers.map((n) => n * 100);

console.log(numbers2);
//[ 100, 200, 300, 400 ]

   ┌───┬───┬───┬───┐  
   │ 1 │ 2 │ 3 │ 4 │  
   └──┬┴─┬─┴─┬─┴─┬─┘  
      │  │   │   │    
     ┌▼──▼───▼──┐│    
     │ function ◄┘     <-- Machine to process
     └┬──┬───┬─┬┘     
      │  │   │ └─┐    
   ┌──▼┬─▼─┬─▼─┬─▼─┐  
   │100│200│300│400│  
   └───┴───┴───┴───┘