What strategies can I use to optimize the code for the function provided?

This function allows for the dynamic display of select tags for location selection based on employee designation. The current code functions correctly, but I believe it can be optimized further.

// Function to activate different location options based on employee designation
function location_served_option_by_designation(filter) {   
    var area_display_setting;
    var city_display_setting;
    var region_display_setting;
    var zone_display_setting;
    var country_display_setting;
    var location_title;

    switch(filter.value.toLowerCase()) {
        case 'bm':
            // Code for BM designation
            break;
        case 'abm':
            // Code for ABM designation
           break;
        case 'rsm':
            // Code for RSM designation
             break;
        case 'zsm':
            // Code for ZSM designation
            break;
        case 'nsm':
            // Code for NSM designation
            break;
    }

    // Display settings for locations
    location_served_area.style.display = area_display_setting;
   

    location_served_country.style.display = country_display_setting;
    

    location_served_title.innerText = location_title[0].toUpperCase() + location_title.slice(1);
}

HTML Markup Image: When 'BM' is selected as the designation, options for country: India, zone: Central Zone, region: Chhattisgarh, and city: Durg1 are displayed. Based on the city, areas for selecting employees service area will be activated. If the designation is 'ZSM', only the country select tag will be activated with checkboxes for choosing zones within that country. https://i.sstatic.net/1xOjH.png

javascript

Answer №1

If I were to address this scenario, I would opt for using if ... else statements over the switch function. I would assign initial values to variables from the beginning and only modify them if they meet specific conditions. For instance, if the filter value matches "nsm," the values will remain constant, allowing us to focus on other cases. In JavaScript, it is advisable to use camelCase for variable names and keep them concise and relevant. Here's how I would refactor the code to adhere to DRY principles:

function byDesignation(filter) {   
  let filterValue = filter.value.toLowerCase();
  let area = "none";
  let city = "none";
  let region = "none";
  let zone = "none";
  let country = "none";
  let locationTitle = "country";

  if (filterValue === "zsm") {
    country = "flex";
    locationTitle = "zone";
  } else if (filterValue === "rsm") {
    locationTitle = "region";
    zone = "flex";
    country = "flex";
  } else if (filterValue === "abm" || filterValue === "bm") {
    locationTitle = "area";
    city = "flex";
    region = "flex";
    zone = "flex";
    country = "flex";  
  }
  // continue with the rest of the function
  // ...
}

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