$ erl
Erlang R16B01 (erts-5.10.2) [source] [64-bit] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false]
Eshell V5.10.2 (abort with ^G)
1> help().
** shell internal commands **
b() -- display all variable bindings
e(N) -- repeat the expression in query <N>
f() -- forget all variable bindings
f(X) -- forget the binding of variable X
h() -- history
history(N) -- set how many previous commands to keep
results(N) -- set how many previous command results to keep
catch_exception(B) -- how exceptions are handled
v(N) -- use the value of query <N>
rd(R,D) -- define a record
rf() -- remove all record information
rf(R) -- remove record information about R
rl() -- display all record information
rl(R) -- display record information about R
rp(Term) -- display Term using the shell's record information
rr(File) -- read record information from File (wildcards allowed)
rr(F,R) -- read selected record information from file(s)
rr(F,R,O) -- read selected record information with options
** commands in module c **
bt(Pid) -- stack backtrace for a process
c(File) -- compile and load code in <File>
cd(Dir) -- change working directory
flush() -- flush any messages sent to the shell
help() -- help info
i() -- information about the system
ni() -- information about the networked system
i(X,Y,Z) -- information about pid <X,Y,Z>
l(Module) -- load or reload module
lc([File]) -- compile a list of Erlang modules
ls() -- list files in the current directory
ls(Dir) -- list files in directory <Dir>
m() -- which modules are loaded
m(Mod) -- information about module <Mod>
memory() -- memory allocation information
memory(T) -- memory allocation information of type <T>
nc(File) -- compile and load code in <File> on all nodes
nl(Module) -- load module on all nodes
pid(X,Y,Z) -- convert X,Y,Z to a Pid
pwd() -- print working directory
q() -- quit - shorthand for init:stop()
regs() -- information about registered processes
nregs() -- information about all registered processes
xm(M) -- cross reference check a module
y(File) -- generate a Yecc parser
** commands in module i (interpreter interface) **
ih() -- print help for the i module
true
2>
So we are tasked with the job of representing a house as a tuple. A house could be represented many different ways in Erlang. Since the details are a little vague we will represent a house as a tuple of 4 elements taking this form: {Address, NumberOfBedrooms, NumberOfBathrooms, ListOfAdditionalFeatures}. Examples:
{"1111 1st Street", 3, 2, [garage]}
{"1113 1st Street", 3, 3, [pool, garage]}
Now that we have defined the structure of the house tuples, we can create lists of tuples to represent streets:
[{"1111 1st Street", 3, 2, [garage]},
{"1113 1st Street", 3, 3, [pool, garage]},
{"1116 1st Street", 3, 2, []}]