I have an array coming from the database grabbing all the id's from a group of elements. However it seems to also be grabbing some negative id's from some backend stuff happening and it's breaking what I need to do with these id's.

Is there a way to remove these negative id's from the array before I loop it and put it in the app?

After I grab them I'm already looping through them.

ids.forEach(function(Id) {
            //Code adding elements matching with id's to the screen
});

I have tried adding an if statement in there to just not run that code if the id is less than 0, but that didn't seem to want to work.

I have an array coming from the database grabbing all the id's from a group of elements. However it seems to also be grabbing some negative id's from some backend stuff happening and it's breaking what I need to do with these id's.

Is there a way to remove these negative id's from the array before I loop it and put it in the app?

After I grab them I'm already looping through them.

ids.forEach(function(Id) {
            //Code adding elements matching with id's to the screen
});

I have tried adding an if statement in there to just not run that code if the id is less than 0, but that didn't seem to want to work.

• javascript
• jquery

3 Answers 3

Just use Array.filter

ids = ids.filter(function(x){ return x > -1 });

Array.filter filters the elements based on the boolean returned. Here we filter only numbers which are greater than -1

Use Array.filter with arrow function.

ids = ids.filter( x => x > -1 ); 

Use grep:

ids = [-1,3,4,-2]
ids = jQuery.grep(ids, function( n, i ) {
  return n>=0;
});
console.log(ids)

Description: Finds the elements of an array which satisfy a filter function. The original array is not affected.