The issue of AngularJS function returning at an incorrect point

Question

The issue of AngularJS function returning at an incorrect point

Can someone explain to me why my JavaScript function behaves this way? It loops through an array of 3 objects, returning true when meeting a condition in the if statement. However, it does not exit after the first true and continues looping, ultimately returning false at the end.

To work around this issue, I created a different variable and returned it at the conclusion of the function. But I am still wondering why it operates like this?

this.CheckRoles = function (authLevel) {

    angular.forEach(currentUser.roles, function (role) {

        if(role >= authLevel)
        {
            //The user has the required permissions
            return true;
        }

    });

    return false;
}

javascript arrays angularjs

Answer 1

Answer №1

When you're inside the callback function passed to angular.forEach, your return is not from the main CheckRoles function.

Similar to the native forEach (and unlike jQuery's each), there is no straightforward way to break out of the angular.forEach loop. One workaround could be throwing an exception for a quick fix, or opt for a traditional loop:

this.CheckRoles = function (authLevel) {
    for (var i=0; i<currentUser.roles.length; i++) {
        var role = currentUser.roles[i];
        if (role >= authLevel) {
            //The user possesses the necessary permissions
            return true; // exit immediately, without checking other roles
        }
    }
    return false;
}

If you prefer using angular.forEach (to iterate over the entire array), you'll need to ensure that a value is being passed back:

this.CheckRoles = function (authLevel) {
    var ok = false;
    angular.forEach(currentUser.roles, function (role) {
        if(role >= authLevel) {
            //The user has the required permissions
            ok = true;
        }
    });
    return ok;
}

If IE8 support isn't essential, a neater and more efficient solution can be achieved using some:

this.CheckRoles = function (authLevel) {
    return currentUser.roles.some(function(role){
        return role >= authLevel;
    });
}

Answer 2

When you're inside the callback function passed to angular.forEach, your return is not from the main CheckRoles function.

Similar to the native forEach (and unlike jQuery's each), there is no straightforward way to break out of the angular.forEach loop. One workaround could be throwing an exception for a quick fix, or opt for a traditional loop:

this.CheckRoles = function (authLevel) {
    for (var i=0; i<currentUser.roles.length; i++) {
        var role = currentUser.roles[i];
        if (role >= authLevel) {
            //The user possesses the necessary permissions
            return true; // exit immediately, without checking other roles
        }
    }
    return false;
}

If you prefer using angular.forEach (to iterate over the entire array), you'll need to ensure that a value is being passed back:

this.CheckRoles = function (authLevel) {
    var ok = false;
    angular.forEach(currentUser.roles, function (role) {
        if(role >= authLevel) {
            //The user has the required permissions
            ok = true;
        }
    });
    return ok;
}

If IE8 support isn't essential, a neater and more efficient solution can be achieved using some:

this.CheckRoles = function (authLevel) {
    return currentUser.roles.some(function(role){
        return role >= authLevel;
    });
}

Answer 3

Answer №2

The reason for your return is due to exiting the forEach callback function, not the main CheckRoles Function.

Answer 4

The reason for your return is due to exiting the forEach callback function, not the main CheckRoles Function.

Answer 5

Answer №3

The genuine comeback emerges from the internal operation rather than the external one. This isn't your typical loop iteration scenario, where a return within the loop will exit the function. To achieve your desired outcome, you must establish a variable within the internal operation and then pass it back through the outer operation.

Answer 6

The genuine comeback emerges from the internal operation rather than the external one. This isn't your typical loop iteration scenario, where a return within the loop will exit the function. To achieve your desired outcome, you must establish a variable within the internal operation and then pass it back through the outer operation.

The issue of AngularJS function returning at an incorrect point

Answer №1

Answer №2

Answer №3

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