Alternative writing of if else in a project

What dare you write more than one in the project if else Judgment is not afraid of being killed ？
Exceed or equal to in the project 3 individual if else If you judge , This kind of writing is unfriendly .

There is such a requirement in the project , Switch between different options , Show different data .
Normal writing , Namely if else Determine the index value of the switch , Then show different data
We will use multiple layers if else, This kind of writing can be used to judge within two , Multi level judgment , Code readability is still poor

	//  Data to show 
	let data = []
	//  Suppose this is the data of catering 
	let cateringData = [1,2,3]
	//  Suppose this is traffic data 
	let trafficData = [1,2,3]
	//  Suppose this is the data of the hotel 
	let hotelData = [1,2,3]

	//  We should reject this kind of writing 
	if (index === 0) {
    
		data = cateringData 
	} else if(index === 1) {
    
		data = trafficData 
	} else if(index === 2) {
    
		data = hotelData  
	}

The following way of writing may be better , This is similar to the strategy pattern
Some people will think that this kind of writing , There seems to be more code , This idea is wrong .
I like what a teacher said ：
If the code is written for , To better show the hierarchy of data , Extra code is necessary

//  Data to show 
	let data = []
	//  Suppose this is the data of catering 
	let cateringData = [1,2,3]
	//  Suppose this is traffic data 
	let trafficData = [1,2,3]
	//  Suppose this is the data of the hotel 
	let hotelData = [1,2,3]

	//  Use this way of writing 
	let	mapData = [
			{
    
				id: 0,
				desc: ' Catering data ',
				fn: () => cateringData 
			},
			{
    
				id: 1,
				desc: ' Traffic data ',
				fn: () => trafficData 
			},
			{
    
				id: 2,
				desc: ' Hotel data ',
				fn: () => hotelData  
			}
		]
		function changeIndex(index) {
    
			data = 	mapData [index].fn()	
		}

tip: There's another one about arrays , Encountered in the project , Next time , You can write it down . It's a little hard .