cs330_f2016:erlang1
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cs330_f2016:erlang1 [2017/03/10 01:10] dhart [Deliverables:] |
cs330_f2016:erlang1 [2021/06/30 23:42] |
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| - | **Note: Specs incomplete, proceed at own risk.** | ||
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| - | ====Objective:==== | ||
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| - | Learn the basics of Elixir. | ||
| - | |||
| - | ---- | ||
| - | |||
| - | ====Preparation:==== | ||
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| - | Install Elixir on your own machine. Use Erlang OTP version 19. Note that Erlang is available on all of the open-lab linux machines as ''/usr/bin/erl''. | ||
| - | |||
| - | ---- | ||
| - | |||
| - | ====Deliverables:==== | ||
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| - | Create a module named ''Elxir_Intro'' that contains the following functions: | ||
| - | * ''fib/1'' | ||
| - | * ''area/2'' | ||
| - | * ''sqrList/1'' | ||
| - | * ''calcTotals/1'' | ||
| - | * ''map/2'' | ||
| - | * ''quickSortServer/0'' | ||
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| - | You do not need to validate function input. | ||
| - | |||
| - | === fib === | ||
| - | <code erlang> | ||
| - | def fib(n) do ... | ||
| - | </code> | ||
| - | fib will return the n'th Fibonacci number where ''fib(1) = 1'', ''fib(2) = 1'', and ''fib(n) = fib(n-1) + fib(n-2).'' | ||
| - | === area=== | ||
| - | <code erlang> | ||
| - | def area(shape, shape_info) do .... | ||
| - | </code> | ||
| - | Area takes either '':rectangle'', '':square'', '':circle'', or '':triangle'' and the shape info, and returns its area. Note for rectangle the shape Info will be a tuple ''{length, height}'', triangle's shape_info will be a tuple ''{base, height}'', and circle and square will each get a single scalar (radius and side length, respectively). Use pattern matching. Also note that pi is called via :math.pi . | ||
| - | |||
| - | === sqrList == | ||
| - | <code erlang> | ||
| - | def sqrList(nums) do .... | ||
| - | </code> | ||
| - | Returns a new list in which each item of ''nums'' has been squared. | ||
| - | |||
| - | === calcTotals === | ||
| - | <code erlang> | ||
| - | def calcTotals(inventory) do ... | ||
| - | </code> | ||
| - | Takes an inventory list of tuples of the form ''{item, quantity, price}'' and returns a list of the form ''{item, total_price}''. (Treat the list item by item: no need to consider the possibility of multiple tuples with the same "item" name.) | ||
| - | |||
| - | |||
| - | === map === | ||
| - | <code erlang> | ||
| - | def map(function, vals) do ... | ||
| - | </code> | ||
| - | Map takes a function and a list vals and applies that function to each item in the list. Note that when using higher order functions in Elixir, you use ''&Module.functionName/arity'' to pass it, and ''functionName.(…)'' to call it. Thus,to test it, the call should look like this ''map(&Module.functionName/arity, list)''. | ||
| - | |||
| - | === quickSortServer === | ||
| - | <code erlang> | ||
| - | def quickSortServer() do ... | ||
| - | </code> | ||
| - | quickSortServer will start a simple server that will receive a list and sort it and send it to the caller. It should sort via a modified version of quickSort as discussed in class. quickSort will choose the pivot randomly, and you will need to implement the new pivot functionality. The module ''random'' function '':random.uniform(N)'' will be useful for this, as well as '':lists.nth(N, List)'' | ||
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| - | It might be helpful to set up a simple client module like this: | ||
| - | <code python> | ||
| - | defmodule Client do | ||
| - | def call(pid,nums) do | ||
| - | send(pid, {nums, self()}) | ||
| - | listen | ||
| - | end | ||
| - | |||
| - | def listen do | ||
| - | receive do | ||
| - | {sorted, pid} -> sorted | ||
| - | end | ||
| - | end | ||
| - | end | ||
| - | </code> | ||
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cs330_f2016/erlang1.txt · Last modified: 2021/06/30 23:42 (external edit)
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