Great write-up! Another way to get a feeling for what, and how, map works is to try to re-implement it in terms of each, something like this
defmy_map(array)# we'll be returning another arrayresponse=[]# for each element in the arrayarray.eachdo|element|# yield/pass element to the provided block, push the result into responseresponse<<(yieldelement)end# return the responseresponseend=>:my_map# kick the tires and double every item in the list:my_map([1,2,3,4,5]){|x|x*2}=>[2,4,6,8,10]
The actual implementation of map in the usual ruby interpreter is done in C for efficiency, but you could build it from each instead (and it helps sometimes to have examples of the concept written in the same language you're working with).
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Great write-up! Another way to get a feeling for what, and how, map works is to try to re-implement it in terms of
each, something like thisThe actual implementation of map in the usual ruby interpreter is done in C for efficiency, but you could build it from
eachinstead (and it helps sometimes to have examples of the concept written in the same language you're working with).