从 JavaScript 函数返回多个值

Question

I'm a newcomer to JavaScript and I'm sure this is very straightforward: I wish to set a number of values based upon a single input in a switch statement. I know in Java I would use getters/setters and or pass the values into an array and pick the relevant field based on its index.

 let custCode; let loyaltyCode; let id; const setCustomerCodes = () => { switch (customerType) { case "NEW": (custCode = "19202"), (loyaltyCode = "X78"), (id = "396550"); break; case "CURRENT": (custCode = "93893"), (loyaltyCode = "X89"), (id = "396438"); break; case "LOYAL": (custCode = "76353"), (loyaltyCode = "X90"), (id = "396440"); break; default: (custCode = "02902"), (loyaltyCode = "X80"), (id = "396637"); break; } return //all values as an object?; }; module.exports = { //export the values to use in separate file };

I then just want to use the value of each field in a separate JS file. I know this is very basic; easier when I can get my head around debugging in VS Code

Answer 1

Here is one possible solution:

 let custCode; let loyaltyCode; let id; const setCustomerCodes = (customerType) => { switch (customerType) { case "NEW": (custCode = "19202"), (loyaltyCode = "X78"), (id = "396550"); break; case "CURRENT": (custCode = "93893"), (loyaltyCode = "X89"), (id = "396438"); break; case "LOYAL": (custCode = "76353"), (loyaltyCode = "X90"), (id = "396440"); break; default: (custCode = "02902"), (loyaltyCode = "X80"), (id = "396637"); break; } return {custCode, loyaltyCode, id} }; let x = setCustomerCodes("NEW"); console.log(x); console.log(x.custCode); console.log(x.loyaltyCode); console.log(x.id);

As @VLAZ suggests, you simply return all of the values in {} as a single object. The x variable I have defined can then be used to get to the individual values (as shown in the separate console.log(...) entries.

Note that you do need to pass in a value for customerType , so I've included that as a parameter

Answer 2

I think you could return an object.

 const setCustomerCodes = () => { switch (customerType) { case "NEW": return {custCode: "19202", loyaltyCode: "X78", id: "396550"} case "CURRENT": return {custCode: "93893", loyaltyCode: "X89", id: "396438"}; case "LOYAL": return {custCode: "76353", loyaltyCode: "X90", id: "396440"}; default: return {custCode: "02902", loyaltyCode: "X80", id: "396637"}; } }; const { custCode, loyaltyCode, id, } = setCustomerCodes() module.exports = { custCode, loyaltyCode, id, };