What angularjs expression syntax is this in ng-class

Question

The AngularJS Noob Handbook has some code which reduces class manipulation to a simple expression and binding :

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Answer 1

This is mentioned briefly (too briefly, in my opinion) in the ngClass documentation. If you pass an object to ngClass, then it will apply each key of the object as a class to the element if that key's value is true. For example:

$scope.first = true
$scope.second = false
$scope.third = true

with

would result in