establishing a controller method according to the specified criteria

My focus is on the GalleryController where I am developing a method known as setCurrent. The main purpose of this method is to take a value and assign it to current. In cases where no value is provided, current should be set to 0.

The code snippet that I have implemented doesn't seem to be producing the desired output:

(function() {
  var app = angular.module('gemStore', []);

  app.controller('GalleryController', function(){
    this.current = 0;

    this.setCurrent = setCurrent(intValue){
      if(intValue === null){

        this.current = 0;
      }
      else {
        this.current = intValue;
      }
    };

  });

  app.controller('StoreController', function(){
    this.products = gems;
  });

  app.controller('TabController', function(){
    this.tab = 1;

    this.setTab = function(newValue){
      this.tab = newValue;
    };

    this.isSet = function(tabName){
      return this.tab === tabName;
    };
  });

Should I prioritize setting this.current = intValue according to the specified requirements?

Answer №1

When no value is passed in, the intValue ends up being undefined, not null. Therefore, your function body will not work as intended.

Furthermore, there appears to be a significant issue here, possibly a typographical error, where you have used setCurrent instead of function.

The question posed at the end of your post is unclear to me, but for desired functionality, consider the following code snippet:

this.setCurrent = function (intValue) {
   if (!intValue) {
     this.current = 0;
   }
   else {
     this.current = intValue;
   }
};

If you truly need to determine whether an argument was provided or not, the most reliable method is to check arguments.length:

this.setCurrent = function (intValue) {
   if (arguments.length === 0) {
     this.current = 0;
   }
   else {
     this.current = intValue;
   }
};

However, this approach may seem unnecessary. If the value is falsy, it is likely already either 0 or an invalid numeric value.

Answer №2

It is recommended to use typeof or angular.isUndefined(intValue) instead of checking for null. :-)

this.setCurrent = function (intValue) {
       if (typeof intValue=='undefined') { //if(angular.isUndefined(intValue))
         this.current = 0;
       }
       else {
         this.current = intValue;
       }
    };

A more concise approach would be:

this.setCurrent = function (intValue) {
           if (typeof intValue!='undefined') { //if(!angular.isUndefined(intValue))
             this.current = intValue;
           }
        };

Answer №3

To determine if a variable is undefined or not, you can use the methods provided by Angular such as angular.isDefined() / angular.isUndefined(). It's recommended to check using the Angular way.

this.setCurrent = function (intValue) {
   if (angular.isDefined(intValue)) {
     this.current = 0;
   }
   else {
     this.current = intValue;
   }
};

I hope this information proves helpful. Thank you.

Answer №4

If you're looking to simplify your code, consider using the ternary OR operator...

app.controller('GalleryController', function(){
    this.currentIndex = 0;
    this.setCurrentIndex = function(newIndex) {
      this.currentIndex = newIndex || 0;
    };
  });

Answer №5

After exploring different options, I discovered an additional approach to achieve the same result:

app.controller('GalleryController', function(){
    this.current = 0;
    this.setCurrent = function(value){
      this.current = value || 0;
    };

Answer №6

const picController = new GalleryController();
picController.currentImage = 0;
picController.setCurrentImage = function(updateIndex) {
    this.currentImage = updateIndex || 0;
};

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