foreach - Why/How does a lodash "[iteratee=_.identity] (Function)" in _foreach have a 'mystery' third param? -

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i getting hang of lodash.js first time today , have discovered can access 'value' 'index' , 'list' within iterator function.

i came across when using _.foreach function.

for example:

_.foreach(omyarray, function(value, index, list){     ... })

however api specifies 2 params "n" , "key" when dealing objects.

why no mention of third?

? api link has 3 arguments listed right there:

the iteratee bound thisarg , invoked 3 arguments: (value, index|key, collection)


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