javascript - documentation function parameter notation meaning -


i have question particular set of notation means. using rangy javascript library work , run across notation 

rangy.createclassapplier(string theclass[, object options[, array tagnames]])

how interpret parameter notation. in particular "[," notation confuses me. i'm guessing means parameters optional i'm not sure , i've had hard time finding answer question online. in advance

here link documentation itself

https://github.com/timdown/rangy/wiki/class-applier-module


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