array size is not being accurately reported

As I try to make sense of this code, something seems off. It appears to be a straightforward portion of a promise chain.

let flightName = [];
let guidArr = [];

Promise.all(guidArr)
       .then(values => {
         for(var a = 0; a < values.length; a++) {
           Xrm.WebApi
              .online
              .retrieveRecord("crd80_flightplanevent", values[a], "?$select=_crd80_learnerflight_value")
              .then(
                function success(result) {
                  flightName.push(result["_crd80_learnerflight_value@OData.Community.Display.V1.FormattedValue"])
                },
                function(error) {
                  DisplayError(error)
                }); 
         }
         return flightName
       }).then(flightName => {
         console.log(flightName) 
         console.log(flightName.length)         
         return flightName
       })

https://i.sstatic.net/3so2V.jpg

The flightName array is correctly displayed in the console, but strangely, the length of flightName always shows as 0 despite the output showing a length of 2 when using console.log(flightName)

What could be causing this discrepancy? I am trying to access each item in the array but it doesn't seem to be working as expected

javascriptarrays

Answer №1

After receiving guidance from @derpircher, the solution provided was successful:

The issue stemmed from not awaiting the promises within the 

for(var a = 0; a < values.length; a++)
loop. This resulted in an empty array when executing return flightName, causing console.log(flightName.length) to return 0. While console.log(flightName) may indicate that there are values present, it is actually referencing the object which is populated after promise resolution. By utilizing 
console.log(JSON.stringify(flightName))
, the output reveals [] as the array remains empty at that point.

To address this issue, consider making the initial then handler async and using await Xrm.WebApi..., or encapsulating the entire process in Promise.all

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