What is the best way to remove elements from an array based on two attributes in AngularJS?

I am working with an array of objects in AngularJS that looks like this: 

var example = [ {id:'1',
                 read: false,
                 folder: 'inbox'},
                {id:'2',
                 read: true,
                 folder: 'inbox'},
                {id:'3',
                 read: true,
                 folder: 'trash'},
                 {id:'4',
                 read: false,
                 folder: 'trash'}];

My goal is to remove any object that contains both folder == 'trash' and read == true.

I attempted to achieve this using lodash:

example = lodash.filter(example, function(value, index) {
    return (value.folder !== 'trash') && (value.read !== true);
});

However, instead of deleting only item #3, it removes both item #3 and item #4.

I seem to be misunderstanding how lodash.filter functions. Can someone please provide some guidance?

javascriptangularjs

Answer №1

Your logical operator is incorrect. Update the condition to be folder == 'trash' and read == true, then negate it.

example = lodash.filter(example, function(value) {
    return !(value.folder == 'trash' && value.read == true);
});

Answer №2

To correct the issue, you should eliminate the quotation marks from around the value 'true'. To retain all elements excluding those in the 'trash' folder or with the read property set to true, your logic should be structured as follows:

return (value.folder !== 'trash') || (value.read !== true);

Answer №3

The operator !== is not correct in this context; consider using == instead.

  return (value.folder == 'trash' && value.read == 'true') == false;

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