erlang精要(22)-归集器、记录

-module(learnerl).
-export([odds_and_evens/1]).
%程序：刘兴
%https://aipro.blog.csdn.net/odds_and_evens(L)->odds_and_evens_acc(L,[],[]).odds_and_evens_acc([H|T],Odds,Evens)->case (H rem 2) of1->odds_and_evens_acc(T,[H|Odds],Evens);0->odds_and_evens_acc(T,Odds,[H|Evens])end;
odds_and_evens_acc([],Odds,Events)->{lists:reverse(Odds),lists:reverse(Events)}.

一次扫描完成奇数和偶数的分别提取。
下面演示记录

－record(student{name=undefined,age=undefined,class=undefined}).

11> rr("learnerl.hrl").
[student]
12> St1=#student{name="张三",age=28,class="计算机与技术1班"}.
#student{name = [24352,19977],age = 28,class = [35745,31639,26426,19982,25216,26415,49,29677]}
13> St2=#student{name="李四",age=25,class="计算机与技术2班"}.
#student{name = [26446,22235],age = 25,class = [35745,31639,26426,19982,25216,26415,50,29677]}
14> St1.
#student{name = [24352,19977],age = 28,class = [35745,31639,26426,19982,25216,26415,49,29677]}
15> St2.
#student{name = [26446,22235],age = 25,class = [35745,31639,26426,19982,25216,26415,50,29677]}17> St3=St2#student{name="王五",age=29}.
#student{name = [29579,20116],age = 29,class = [35745,31639,26426,19982,25216,26415,50,29677]}
18> St3.
#student{name = [29579,20116],age = 29,class = [35745,31639,26426,19982,25216,26415,50,29677]}
19> #student{name=Name,class=Class}=St2.
#student{name = [26446,22235],age = 25,class = [35745,31639,26426,19982,25216,26415,50,29677]}
20> Name.
[26446,22235]
21> Class.
[35745,31639,26426,19982,25216,26415,50,29677]22> St3#student.age.
29
23> St3#student.name.
[29579,20116]26> St4=St2#student{name="Steven",age=29}.
#student{name = "Steven",age = 29,class = [35745,31639,26426,19982,25216,26415,50,29677]}
27> St4#student.name.
"Steven"
28>

记录匹配

72> c(learnerl).
{ok,learnerl}
73> Stdlst2=learnerl:init_std().
[#student{name = [24352,19977],age = 28,class = [35745,31639,26426,19982,25216,26415,49,29677]},#student{name = [26446,22235],age = 25,class = [35745,31639,26426,19982,25216,26415,50,29677]},#student{name = [29579,20116],age = 29,class = [35745,31639,26426,19982,25216,26415,50,29677]},#student{name = "Steven",age = 29,class = [35745,31639,26426,19982,25216,26415,50,29677]},#student{name = [24352,21326],age = 23,class = [35745,31639,26426,19982,25216,26415,49,29677]}]
74> learnerl:get_student(Stdlst1,25).
[{[24352,19977],28,[35745,31639,26426,19982,25216,26415,49,29677]},{[26446,22235],25,[35745,31639,26426,19982,25216,26415,50,29677]},{[29579,20116],29,[35745,31639,26426,19982,25216,26415,50,29677]},{"Steven",29,[35745,31639,26426,19982,25216,26415,50,29677]}]
75> learnerl:get_student(Stdlst1,28).
[{[24352,19977],28,[35745,31639,26426,19982,25216,26415,49,29677]},{[29579,20116],29,[35745,31639,26426,19982,25216,26415,50,29677]},{"Steven",29,[35745,31639,26426,19982,25216,26415,50,29677]}]
76> learnerl:get_student(Stdlst1,23).
[{[24352,19977],28,[35745,31639,26426,19982,25216,26415,49,29677]},{[26446,22235],25,[35745,31639,26426,19982,25216,26415,50,29677]},{[29579,20116],29,[35745,31639,26426,19982,25216,26415,50,29677]},{"Steven",29,[35745,31639,26426,19982,25216,26415,50,29677]},{[24352,21326],23,[35745,31639,26426,19982,25216,26415,49,29677]}]
77>

-module(learnerl).
-export([get_student/2,init_std/0]).
%程序：刘兴
%https://aipro.blog.csdn.net/
-record(student,{name=undefined,age=undefined,class=undefined}).init_std()->St1=#student{name="张三",age=28,class="计算机与技术1班"},St2=#student{name="李四",age=25,class="计算机与技术2班"},St3=St2#student{name="王五",age=29},St4=St2#student{name="Steven",age=29},St5=#student{name="张华",age=23,class="计算机与技术1班"},[St1,St2,St3,St4,St5].get_student(StdLst,GetAge) ->[{Name,Age,Class}||#student{name=Name,age=Age,class=Class}<-StdLst,Age >= GetAge].

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