The type of source items. A database-record for instance.
The type of target items. A MaquetteComponent for instance.
function(source) that must return a key to identify each source object. The result must either be a string or a number.
function(source, index) that must create a new result object from a given source. This function is identical
callback argument in
function(source, target, index) that updates a result to an updated source.
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Creates a Mapping instance that keeps an array of result objects synchronized with an array of source objects. See with arrays.