How come the item I just inserted into a JavaScript array is showing up as undefined when I try to retrieve it immediately after adding it?

Apologies for the messy code, but I'm facing an issue with my JavaScript. I can't figure out why the specified child is not considered as a task to derive from:

          var childrenToOperateOn = [];

          for (var i = 0; i < $scope.derivedTasksToIndent.length; i++) {
            if($scope.derivedTasksToIndent[i].todosernm == todo.todosern){
              childrenToOperateOn.push($scope.derivedTasksToIndent[i]);
              console.log("Affecting child: " + $scope.derivedTasksToIndent[i].todotask);

              for (var child in childrenToOperateOn) {
                console.log("Confirm child: " + child.todotask);
              }
            }
          }

Instead of retrieving the expected value from the childrenToOperateOn array, all I get is undefined:

(index):145 Affecting child: A task to derive from
(index):147 Confirm child: undefined

I am using AngularJS, in case that information helps in any way.

How can I ensure that the correct value and its properties are retained? What mistake am I making here?

javascriptangularjs

Answer №1

Opt for using for ... of rather than for ... in.

for (let item of itemsToProcess) {
    console.log("Checking item: " + item.task);
}

While both for..of and for..in loops iterate through lists, they vary in the values they iterate over; for..in retrieves a list of keys from the object being looped over, whereas for..of fetches a list of values of the numeric properties of the object being iterated.

For additional details, visit: https://www.typescriptlang.org/docs/handbook/iterators-and-generators.html

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