map get first element array javascript code example

Example 1: get first 10 items of array javascript

const list = ['apple', 'banana', 'orange', 'strawberry']
const size = 3
const items = list.slice(0, size) // res: ['apple', 'banana', 'orange']

Example 2: 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>
   )
}