Is there any good example of use cases for angular.identity()?

Question

According to the documentation

A function that returns its first argument. This function is useful when writing code in the functional style.

I

Answer 1

Lets say we have these two below functions:

$scope.square = function(n) {
return n * n
};


$scope.multplybyTwo = function(n) {
return n * 2
};

To call this in a functional way:

$scope.givemeResult = function(fn, val) {
return (fn || angular.identity)(val);
};

Then You may use the above function something like below:

$scope.initVal = 5;
$scope.squareResult = $scope.givemeResult($scope.square, $scope.initVal);
$scope.intoTwo = $scope.givemeResult($scope.multplybyTwo, $scope.initVal);

You may follow the below link:

http://litutech.blogspot.in/2014/02/angularidentity-example.html