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Please explain usage of _.identity(value) of underscore.js. Not able to understand it from the documentation ( http://underscorejs.org/#identity ).
Can you provide some example of its usage?
It’s essentially a no-operation function. It returns the value of whatever was passed into it.
The part about it being used as a “default iterator” within the library itself means that in other functions which may have an optional “iterator” parameter (which is likely used as a function to apply to each element of an array of some kind), if no iterator parameter is passed, the library will use this “no-op” iterator instead and the elements of the array will remain unchanged.