Answers for "javascript loop first item map"

how to loop through a map in js

var myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");

for (const [key, value] of Object.entries(myMap)) {
  console.log(key, value);
}

get the first value when mapping through the array

if (index === 0) {
    return (
    <h1 className="box_list_header"
    onClick={this.handleBackToRoomList}
    >{room.room_name}</h1>
   )
}