Javascript - 클로져( Closure )

function getData( $key ){

let data = [

{ name : "A", value : 37 },

{ name : "B", value : 21 },

{ name : "C", value : 15 },

{ name : "D", value : 21 },

{ name : "E", value : 33 }

]

return ( $index ) => data[ $index ][ $key ];

}

let name = getData( "name" );

console.log( name( 0 ));

console.log( name( 2 ));

console.log( name( 4 ));

let value = getData( "value" );

console.log( value( 0 ));

console.log( value( 2 ));

console.log( value( 4 ));