The Typescript loop appears to be stuck and not moving through the

Question

The Typescript loop appears to be stuck and not moving through the

I have encountered a problem while trying to iterate through my array using foreach and forloop in an angular 8 application. Despite having 250 objects in the array, it is not iterating through any elements. I am unable to figure out what the issue could be. Can anyone help me identify the problem?

Below is the code snippet I am using:

if (attributeValue.lovAvailable) {

    console.log('LOV....', attributeObject.attributeLOVList);

    attributeObject.attributeLOVList.forEach(element => {

        console.log('element', element);
            
    });   
}

This is the console output of my list:

This is the expand list:

javascript angular typescript

Answer 1

Answer №1

It appears that you are attempting to iterate over a list before it has been properly initialized.

This can be seen in the screenshot of the console.log that was provided, where it displays [], indicating an empty list at that point in time.

Ensure that you wait for the list to be fully initialized before attempting to use it. If the list is passed as an @Input, remember that you should not access it in the constructor, but rather in the ngOnInit lifecycle hook.

*Note:
The console log output represents a reference to the object, not a snapshot. This explains why all the elements appeared in the list after expanding it in the second image, once it had been fully initialized (even though the initial display still showed []).

Edit:
Here's an example demonstrating this with console.log:

interface MyObject {
    name: string;
}

let list: MyObject[] = [];

console.log(list);
console.log(list.length);

list.push({name: 'Hello'});
list.push({name: 'From'});
list.push({name: 'The'});
list.push({name: 'Other'});
list.push({name: 'Side'});

Output:
https://i.sstatic.net/dqX7n.png

Answer 2

It appears that you are attempting to iterate over a list before it has been properly initialized.

This can be seen in the screenshot of the console.log that was provided, where it displays [], indicating an empty list at that point in time.

Ensure that you wait for the list to be fully initialized before attempting to use it. If the list is passed as an @Input, remember that you should not access it in the constructor, but rather in the ngOnInit lifecycle hook.

*Note:
The console log output represents a reference to the object, not a snapshot. This explains why all the elements appeared in the list after expanding it in the second image, once it had been fully initialized (even though the initial display still showed []).

Edit:
Here's an example demonstrating this with console.log:

interface MyObject {
    name: string;
}

let list: MyObject[] = [];

console.log(list);
console.log(list.length);

list.push({name: 'Hello'});
list.push({name: 'From'});
list.push({name: 'The'});
list.push({name: 'Other'});
list.push({name: 'Side'});

Output:
https://i.sstatic.net/dqX7n.png

The Typescript loop appears to be stuck and not moving through the

Answer №1

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