Core Collection Functions

conj : conjoin returns new collection with an added element or key-value pair

assoc : associate returns new collection with added/modified value for given key or index

dissoc : dissociate returns new map in which a key has been removed

merge : returns a new map that combines the key-value pairs of one or more maps

get : returns value for a given key or index in a collection

pop : returns a new collection without the first element / key-value pair

peek : returns the element / key-value pair that would be removed by pop

first : returns the first element of the collection (or nil if the sequence has zero elements)

rest : returns a sequence of all the elements of the original except the first

seq : returns a sequence of a seq-able type's elements