CODEWITHSUNDEEP
javascriptnode.js
Phani Kumar
Phani Kumar

Reputation: 9

conditional promise in Node js

how to call conditional promise without nested promise and execute the rest of the code irrespective whether condition statisfy or not

        findAllByServiceProviderLocationId(serviceProviderLocationId, supplierId)
    .then(result => {
    // 1. set all the default values
    ChargesAdminController._setDefaultValues(result);
    //Based on some condition in result - i need to call new promise
    //If condition satisfy, do promise operation and continue executing. is there better way to do apart from nested promise`enter code here`
    //Ex:
    if(result.checkPricing){
        DBConnection.getPricing(result)
     }
        //some operations on result object before sending response - All these operations should run only after the conditional promise is fulfilled 
    })

Upvotes: 1

Views: 488

Answers (1)

jfriend00
jfriend00

Reputation: 708176

This type of logic is simplest with async/await because you can write more traditional sequential code flow logic.

async function myFunc() {
    let result = await someFunc1();
    if (result.whatever === something) {
         // asynchronous operation inside the if statement
         await someFunc2();
    }
    // code here that gets executed regardless of the above if
    let someOtherResult = await someFunc3();
    return someResult;
}

Without async/await you do have to do some nesting, but only for the conditional:

function myFunc() {
    return someFunc1().then(result => {
        if (result.whatever === something) {
            // asynchronous operation inside the if statement
            return someFunc2();
        } else {
            return somethingElse;
        }
    }).then(thing => {
        // code here that gets executed regardless of the above if statement
        return someFunc3();
    });
}

Upvotes: 2

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