Just trying to understand optional chaining and unsure if it can be used in the following situation with .entries, that is:
for (const [index, val] of Array.from(myArray)?.entries()) {
if (val.status === 1) {
. . .
. . .
}
}
I basically don't want to proceed if myArray is empty.
If you look for a short null check, I think your problem is not from Array.from but it's from myArray variable. If myArray is undefined, Array.from(myArray)?.entries() will throw an error
const myArray = undefined
const entries = Array.from(myArray)?.entries() //throw an error
If you want to overcome this, you need to use short circuit evaluation to assign the default value [] whenever myArray is undefined or null
const myArray = undefined
const entries = Array.from(myArray || []).entries() //working!
If myArray is already an array (or possibly an undefined value), you can get rid of Array.from too
const myArray = undefined
const entries = myArray?.entries() || [] //assign a default value for your loop
Array.fromnever returns null or undefined. But if an array is empty, iterating over it doesn’t do anything anyway.myArrayis empty to begin with, then this part of the code will not crash out - correct?Array.fromeither.