sortBy :: Enumerable |
Elements of equivalent criterion value are left in existing order. Computed criteria must have well-defined strict weak ordering semantics (i.e. the < operator must exist between any two criteria).
Note that arrays already feature a native sort method, which relies on natural ordering of the array's elements (i.e. the semantics of the < operator when applied to two such elements). You should use sortBy only whe natural ordering is inexistent or otherwise unsatisfactory.
Examples
['hello', 'world', 'this', 'is', 'nice'].sortBy(function(s) { return s.length; }) // -> 'is', 'this', 'nice', 'hello', 'world']
['hello', 'world', 'this', 'is', 'cool'].sortBy(function(s) { var md = s.match(/[aeiouy]/g); return null == md ? 0 : md.length; }) // -> [ 'world', 'this', 'is', 'hello', 'cool'] (sorted by vowel count)
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Prototype API 1.5.0 - prototypejs.org