How to call dynamically generate function name and parameters [duplicate]

Question

I am trying to condense a potentially large switch case into a simple expression in nodejs. This is what I current have

exports.ManagerRequest = functions.https.onCall(async (data, context) => {

              console.log('[INDEX], @request1',data);

              const func = data.function
              const data1 = data.value

                switch (func) {
                  case 'request1':
                     const res = manager.request1(data1)
                    break;
                  case 'request2':
                     const res = manager.request2(data1)

                  default:
                    console.log(`Sorry, we are out of ${func}.`);
                }

 
    return res

})

I have manager imported and many functions in manager which i am calling based on the requested function in data. The switch cases will significantly expand. is there a way to call automatically insert the function name and associated data. something that look like this

const res = manager.'{func(data)}'

How can the function name and data be dynamically generated ?

Take a look at stackoverflow.com/questions/359788/…

AlexSp3
– AlexSp3

2021-07-23 18:57:10 +00:00
Commented Jul 23, 2021 at 18:57 — AlexSp3
– AlexSp3, Commented Jul 23, 2021 at 18:57

AlexSp3 · Accepted Answer · 2021-07-23 19:04:10Z

0

Call them in this way:

window["Namespace"]["functionName"](arguments);

In your case it would be:
```
window["manager"][func](data1);
```

answered Jul 23, 2021 at 19:04

AlexSp3

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Comments

Pedro Nascimento · Accepted Answer · 2021-07-23 19:08:28Z

I'm not sure I understand the question. Do you mean to dynamically dispatch a method call to manager based on a string input? If so it can be done like this:

exports.ManagerRequest = functions.https.onCall(async (data, context) => {

              console.log('[INDEX], @request1',data);

              const functionName = data.function
              const data1 = data.value
              const func = manager[functionName];

              if (func && func instanceof Function) {
                  return func(data1);
              } else {
                  console.log(`Sorry, we are out of ${functionName}.`);
              }
}

Just be careful that the input is trusted, otherwise this could very well become an attack surface as it allows the client call an arbitrary method of manager.

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