Using Javascript to create a conditional variable within a function

Attempting to conditionally set a variable to handle the first click user case. The goal is to set the variable based on that condition. An attempt is made to instantiate a model which retrieves the variable, but on the first click, the model has not been instantiated, resulting in an error. The desired solution is to set the variable as follows:

 var filterInstance = $scope.filterModel.getChecks() ? $scope.filterModel.getChecks() : {};

The goal is for filterInstance to check $scope.filterModel.getChecks(), and if it returns undefined, set it to an empty object. Otherwise, use $scope.filterModel.getChecks(). Any guidance on this issue would be much appreciated. Thank you!

Answer №1

Make sure to inspect the attribute that points to the method, but refrain from executing the method itself. To achieve this, omit the parentheses ().

let instance = $scope.model.getInstance ? $scope.model.getInstance() : {};

Answer №2

Here is an alternative option:

 let filterInstance = $scope.filterModel.getChecks !== null ? $scope.filterModel.getChecks() : {};

Answer №3

Here's a simplified approach:

let filterInstance = ($scope.filterModel.getChecks && $scope.filterModel.getChecks()) || {};

With this modification, if $scope.filterModel.getChecks is defined and $scope.filterModel.getChecks() returns a truthy value, it will be assigned to filterInstance; otherwise, it will default to an empty object.

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