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Shorthands to generate iterator functions for most of the common use cases of the collection methods. Its like a souped up version of _.pluck for the following functions:

any, all, map, detect, filter

The basic shorthand is to perform a === between a key and a value:

_.any(dogs, 'name', 'leroy')  // generates an iterator that looks like:
_.any(dogs, function (dog) { return === 'leroy'; })

_.detect(dog, 'age', 5),
_.detect(dog, function (dog) { return dog.age === 5; })

If you've got multiple key/values you want to check against, you can pass an object instead:

_.filter(dogs, {age: 5, name: 'lily'})
_.filter(dogs, function (dog) { return dog.age === 5 && == 'lily'; })

There's some special cases that are handled too.

If you just a key (technically, if value is undefined), it will return the property at that key:, 'name'), function (dog) return; })  // or _.pluck(dogs, 'name')

If the key ends with (), it will use the result of invoking that function:, 'isYappy()'), function (dog) { return dog.isYappy(); })

If value is a regex a string match iterator is built:

_.all(dogs, 'name', /(a|e|i)/)
_.all(dogs, function (dog) { return /(a|e|i)/.test(; })

By using _.mixin(), all these shorthands are available on the wrapper too:

_(dogs).all('name', /(a|e|i)/)


You can still of course pass a normal iterator function in, which flexyargs will quickly pass through to the standard underscore implementation. No matter the case, if the native version of a collection method is available, it will be used!

Only the methods listed above have the flexy magic, not some, every and other aliases.