What is the best way to selectively remove and then later reinsert two items from an array in

I am facing a scenario where I have two buttons and an array to work with.

The buttons are labeled "OR" and "AND", and the array consists of 7 items in a Dropdown list.

When the user clicks on the "OR" button, it should remove 2 items from the array.

Conversely, when the user clicks on the "AND" button, all 7 initial items should be retained in the array.

I am exploring options to dynamically add and remove these two items from the array. What is the best approach for implementing this?

Below is the HTML code snippet for the buttons (ruleOperator):

<label *ngFor="let ruleOperator of ruleOperatorArray"
       [class.active]="rule.ruleOperator === ruleOperator.value"
       (click)="rule.ruleOperator = ruleOperator.value"
       class="nano-radio-button">
    <span>
        {{ ruleOperator.name }}
    </span>
</label>

Attached is the dropdown component placed alongside the buttons:

The "arrayOfOptions" refers to the array from which addition/removal of items is required.

<nano-drop-down [arrayOfOptions]="audienceRuleTypes"
                [selectedOptions]="rule.ruleClass"
                (selectedOptionsChange)="rule.onRuleChange($event)">
</nano-drop-down>

This is how the array looks like:

export const RULE_ARRAY = [
    {value: 'SimplePixel', name: 'Simple Pixel Call'},
    {value: 'SearchTerms', name: 'Search Terms'},
    {value: 'DataPartner', name: 'Data Partner'},
    {value: 'Category', name: 'Category Rule'},
    {value: 'GeoCountry', name: 'Geo Location Country'},
    {value: 'GeoCity', name: 'Geo Location City'},
    {value: 'ImpressionAdvertiser', name: 'Advertiser (Viewer)'},
    {value: 'ImpressionCampaign', name: 'Campaign (Viewer)'},
    {value: 'ClickAdvertiser', name: 'Advertiser (Clicker)'},
    {value: 'ClickCampaign', name: 'Campaign (Clicker)'},
    {value: 'ConversionAdvertiser', name: 'Advertiser (Buyer)'},
    {value: 'ConversionCampaign', name: 'Campaign (Buyer)'}
];   
public audienceRuleTypes = RULE_ARRAY;

Answer №1

It seems like you have an array with various elements:

[
    {value: 'SimplePixel', name: 'Simple Pixel Call'},
    {value: 'SearchTerms', name: 'Search Terms'},
    {value: 'DataPartner', name: 'Data Partner'},
    {value: 'Category', name: 'Category Rule'},
    {value: 'GeoCountry', name: 'Geo Location Country'},
    {value: 'GeoCity', name: 'Geo Location City'},
    {value: 'ImpressionAdvertiser', name: 'Advertiser (Viewer)'},
    {value: 'ImpressionCampaign', name: 'Campaign (Viewer)'},
    {value: 'ClickAdvertiser', name: 'Advertiser (Clicker)'},
    {value: 'ClickCampaign', name: 'Campaign (Clicker)'},
    {value: 'ConversionAdvertiser', name: 'Advertiser (Buyer)'},
    {value: 'ConversionCampaign', name: 'Campaign (Buyer)'}
]; 

If you want to remove the 5th and 6th elements from the array on a specific event, resulting in:

[
    {value: 'SimplePixel', name: 'Simple Pixel Call'},
    {value: 'SearchTerms', name: 'Search Terms'},
    {value: 'DataPartner', name: 'Data Partner'},
    {value: 'Category', name: 'Category Rule'},
    {value: 'ImpressionAdvertiser', name: 'Advertiser (Viewer)'},
    {value: 'ImpressionCampaign', name: 'Campaign (Viewer)'},
    {value: 'ClickAdvertiser', name: 'Advertiser (Clicker)'},
    {value: 'ClickCampaign', name: 'Campaign (Clicker)'},
    {value: 'ConversionAdvertiser', name: 'Advertiser (Buyer)'},
    {value: 'ConversionCampaign', name: 'Campaign (Buyer)'}
]; 

You can maintain two separate arrays for static and dynamic parts like this:

export const STATIC_PART = [
    {value: 'SimplePixel', name: 'Simple Pixel Call'},
    {value: 'SearchTerms', name: 'Search Terms'},
    {value: 'DataPartner', name: 'Data Partner'},
    {value: 'Category', name: 'Category Rule'},
    {value: 'ImpressionAdvertiser', name: 'Advertiser (Viewer)'},
    {value: 'ImpressionCampaign', name: 'Campaign (Viewer)'},
    {value: 'ClickAdvertiser', name: 'Advertiser (Clicker)'},
    {value: 'ClickCampaign', name: 'Campaign (Clicker)'},
    {value: 'ConversionAdvertiser', name: 'Advertiser (Buyer)'},
    {value: 'ConversionCampaign', name: 'Campaign (Buyer)'}
]; 

export const DYNAMIC_PART = [
    {value: 'GeoCountry', name: 'Geo Location Country'},
    {value: 'GeoCity', name: 'Geo Location City'}
]

When you need a larger array, concatenate the DYNAMIC_PART, and when you need a smaller one, simply use the static part.

To add the dynamic part programmatically, you can use the following code snippet:

const z = STATIC_PART.splice(4, 0, DYNAMIC_PART[0], DYNAMIC_PART[1]);

The first parameter in splice specifies the position to make changes (in this case, 4th position), the second parameter indicates the number of items to remove (0 for this scenario), and the rest indicate the items to insert. More information about splice here

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