I'm facing some uncertainties with a couple of AngularJS code snippets

At my workplace, I am tasked with making modifications to an angularjs project. However, I find the code quite complex and challenging to fully comprehend:

app.controller("complementsController", function($scope, $rootScope, $mdSidenav, $timeout, $localStorage, $window) {
    $scope.storage = $localStorage;
    $scope.arrayCubiert = $scope.storage.cocinaCubiert.split("-");
    $scope.tipoCubiert = $scope.arrayCubiert[1];
    $scope.return = function() {
        $window.history.back()
    };
    $scope.configurations = [{
        logo: "some-logo",
        val: 1
    }];
    "CUE" != $scope.tipoCubiera && "CUF" != $scope.tipoCubiert && "CUS" != $scope.tipoCubiert || $scope.configurations.push({
        logo: "fiss-logo",
        val: 2
    });
    "CUE" == $scope.tipoCubiert && $scope.configurations.push({
        logo: "grafett-essence",
        val: 3
    });
    $scope.opcionTitle = "EhapeAL", $scope.opcionImg = [ ["EAL.png", "EhapeAL AL"] ];
    $scope.opcionBtn = 1, $timeout(function() {
        $mdSidenav("sidebar").toggle().then(function() {})
    }, 500);

The part that stands out as unclear to me is:

"CUE" != $scope.tipoCubierta && "CUF" != $scope.tipoCubierta && "CUS" != $scope.tipoCubierta || $scope.configuraciones.push({ logo: "fisso-logo", val: 2 }),

I wonder if this is some sort of shorthand conditional statement? If so, how would it be written in a more traditional format?

javascriptangularjs

Answer №1

According to information from MDN regarding logical operators:

Short-circuit evaluation

When evaluating logical expressions, they are checked from left to right for the possibility of "short-circuit" evaluation based on the following principles:

false && anything results in false due to short-circuit evaluation.

true || anything results in true due to short-circuit evaluation.

The laws of logic ensure the accuracy of these evaluations. It is important to note that the "anything" part of the expressions mentioned above is not assessed, therefore any side effects are not triggered.

Therefore, the conventional approach for the code above would be:

if(!("CUE" != $scope.tipoCubierta && "CUF" != $scope.tipoCubierta && "CUS" != $scope.tipoCubierta)){
     $scope.configuraciones.push({ logo: "fisso-logo", val: 2 })
}

Answer №2

Regarding AngularJS, it's important to note that the code snippet provided is pure JavaScript. For example:

4 != 1 && 4 != 2 && 4 != 3 || console.log("hello world")

can be rephrased as:

if(4 != 1 && 4 != 2) {
 if( !(4 != 3){ 
  console.log("hello world");
  }
}

//Keep in mind that using foo == 1 && (foo == 2 || foo == 3) would yield the same result

I hope this clarifies things for you.

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