double insert:into:

gistfile1.st

quantityOfIngredient: theIngredient
	
"return the accumulated quantity of an ingredient across all recipes"

^ recipes inject: 0 into: [ :totalQuantity :aRecipe | 
	aRecipe ingredients inject: totalQuantity into: [ :theTotalQuantity :anIngredient | 
		( theIngredient = anIngredient )
			ifTrue: [ theTotalQuantity + anIngredient quantity ]
			ifFalse: [ theTotalQuantity ]
		]
	]