Dynamic function call from dynamic string using nodejs - node.js

Question

I'm using express nodejs, in my project, one scenario occurred while doing work on a specific module. I have made different functions for different roles, so based on the logged-in user's role, dynamically calling the other function. I want a trick that code should be a minimum of lines. So please suggest me a good solution.
if (userRole.code === ROLE.REFERRINGPROVIDER) {
query = await referralUser(tabCode, userId, query);
} else if (userRole.code === ROLE.CONSULTINGPROVIDER) {
query = await consultingUser(tabCode, userId, query);
} else if (userRole.code === ROLE.PARENT) {
query = await parentUser(tabCode, userId, query);
} else if (userRole.code === ROLE.PHYSICIAN) {
query = await physicianUser(tabCode, userId, query);
}
As shown in the above example I have to write that code for different users, so I have to make it a simple one-line function.

Answer 1

You can use this solution :)
const userRole = { code: 'referral' };
async function referralUser(tabCode, userId, query){
console.log(tabCode, userId, query);
return "referralUser Called!";
}
async function consultingUser(tabCode, userId, query){
console.log(tabCode, userId, query);
return "consultingUser Called!";
}
async function parentUser(tabCode, userId, query){
console.log(tabCode, userId, query);
return "parentUser Called!"
}
let functionName = userRole.code + 'User';
eval(functionName)("tabCode", "userId", "query").then((results)=>{
console.log(results);
});

Answer 2

You can call functions by their string name. For instance:
function funcOne() {
console.log('funcOne');
}
function funcTwo() {
console.log('funcTwo');
}
function funcThree() {
console.log('funcThree');
}
function funcFour() {
console.log('funcFour');
}
function funcFive() {
console.log('funcFive');
}
const func: { [K: string]: Function } = {
funcOne,
funcTwo,
funcThree,
funcFour,
funcFive
};
// console log output: "funcOne"
func['funcOne']();
// console log output: "funcFour"
func['funcFour']();
// console log output: "funcTwo"
func['funcTwo']();
In your case, use ROLE to map its keys to functions:
const func: { [K: string]: Function } = {
[ROLE.REFERRINGPROVIDER]: referralUser,
[ROLE.CONSULTINGPROVIDER]: consultingUser,
[ROLE.PARENT]: parentUser,
[ROLE.PHYSICIAN]: physicianUser
};
query = await func[userRole.code](tabCode, userId, query);