JavaScript How do I use a JavaScript forEach?

[Malcolm]

Hi all,

I’m trying to use the array method “forEach” but not sure if I’m using it correctly as I keep getting “…not a function”.

So I converted an AJAX response to JSON and want to insert each item into an array. Im doing it this way so I can minimize the stuff that’s not useful to me.

I’m trying to use a forEach on the response JSON to push each object into the array by using this code:

array.forEach(function(){
   array2.push(this);
});

But this isn’t working, wondering if anyone could explain what I’m doing wrong and how to accomplish what I’m after.

Any help would be greatly appreciated

 

[Johna]

Hey there,
I had a similar issue recently when working with XML files. In my case, I used querySelectorAll, so what was returned was a NodeList and not an array. What worked for me was to convert the list to an array using Array.from(), so something like this for your code:

Array.from(array).forEach(function(){
   array2.push(this);
});

If this doesn't work, try logging the response to the console to make sure it's actually an array and not an object or other data type.

 

[Malcolm]

Hey there,
I had a similar issue recently when working with XML files. In my case, I used querySelectorAll, so what was returned was a NodeList and not an array. What worked for me was to convert the list to an array using Array.from(), so something like this for your code:

Array.from(array).forEach(function(){
   array2.push(this);
});

If this doesn't work, try logging the response to the console to make sure it's actually an array and not an object or other data type.

Hey Johna,

Thanks for sharing! So I found a solution and it's similar to what you suggested. The problem was I was using an array method (forEach) on an object. However, there was an array inside the object - so instead I specified the array inside then used forEach to through each array item.

Example:

groupObjects.objects.forEach(function(object){
    array.push(object);
});