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Ember
v1.10.0.
Incrementing Or Decrementing A Property
Problem
You want to increment or decrement a property.
Solution
Use the incrementProperty or decrementProperty methods of Ember.Object.
To increment:
person.incrementProperty('age');
To decrement:
person.decrementProperty('age');
Discussion
You can optionally specify a value to increment or decrement by:
person.incrementProperty('age', 10);