How to sum properties of the objects within an array in Ruby
- by Ernst Fitschen
I understand that in order to sum array elements in Ruby one can use the inject method, i.e.
array = [1,2,3,4,5];
puts array.inject(0, &:+)
But how do I sum the properties of objects within an object array e.g.
There's an array of objects and each object has a property "cash" for example. So I want to sum their cash balances into one total. Something like...
array.cash.inject(0, &:+) (but this doesn't work)
I realise I could probably make a new array composed only of the property cash and sum this, but I'm looking for a cleaner method if possible!
