.iex.exs in your ~ home directory and see the magic. You can also download the file HEREx sigil calls its respective sigil_x definitiondefprotocol and defimpl are used to define Protocols and Protocol implementations respectively for different types in the following example.iex and executetrue ? "yes" : "no" . So, the following is suggested.or operation. For example:|| is only a shortcut for Kernel.|| . We can use Kernel.|| in the pipeline instead to avoid breaking the pipeline.quote and Macro.to_string you can see how our code was grouped into.|| operator always returns the first expression which is true. Elixir doesn’t care about the remaining expressions, and won’t evaluate them after a match has been found.nil is also false in elixir next :blackode which evaluates to true and its value is returned immediately with out evaluating the :elixir and :jose . Similarly if all the statements evaluates to false the last expression is returned.&& returns the second expression if the first expression is true or else it returns the first expression with out evaluating the second expression. In the above examples the last one is the situation where we encounter to use the && operator."5" > 4 unknowingly by an accident and to my surprise it returned with true.number < atom < reference < fun < port < pid < tuple < map < list < bitstring (binary)
"$34.56" which is a string and I suppose do arithmetic operations. I usually do something like this before binary pattern matching... to retrieve the data from the keys as map.key unlike the usual notation like map["key"] . That really saves on typing. But, I don’t encourage this because, as programmers we should really care about memory.. form which is not present in the map, it will raise a key error instead of returning the nil unlike the map["key"] which returns nil if key is not present in a map.>=1.4.0 has ANSI color printing option to console. You can have great fun with colors. You can also provide background colors.when cannot accept custom defined functions. Consider the following lines of code…Hello and a function hello that takes two parameters of name and age. So, based on age I am trying IO.putsaccordingly. If you do so you will get an error saying….macros Lets do that…MyGuards and make sure the module is top of the module Hello so, the macros first gets compiled. Now compile and execute you will see the following output..defguard is also a macro. You can also create private guards with defguardp. Hope, you got the point here.
Consider the following example.defguard and defguardp should reside inside the module like other macros. It raises a compile time error, if some thing that don't fit in the guard clause section when.three or five, you can define the guard as following.boolean value.ensure_compile to check whether the module is compiled or not…Elixir. So in the defmodule Blackode example Blackode is equivalent to :"Elixir.Blackode"String.to_atom "Blackode" it converts it into :Blackode But actually we need something like “Blackode” to Blackode. To do that we need to use Module.concat= does the pattern match for left and right side. We cannot do [a, b, c] = [1, 2, 3, 4] this raise a MatchErrordestructure/2 to do the job.nil value for remaining entries..inspect and label option. The string of label is added at the beginning of the data we are inspecting.|> pipe operations like following……output&like following..fn to define anonymous functions.Kernel.then/2 function since 1.12.0? operator to retrieve character integer codepoints.,mix.exs .mix tool.aliases field., at the end when you add this in the middle of list .aliases() should return the key-value list.mix ecto.setup the three tasks ecto.create, ecto.migrate and ecto.seed will run one after the other.bytecode in a memory. You access the documentation with the help of Code.get_docs/2 function . This means, the documentation accessed when it is required, but not when it is loaded in the virtual machine like iextest.ex with the following code. You can copy and paste it.nil when you are trying to access the docs of the module you have created so far. This is because, the bytecode is not available in disk. In simple way beam file is not present. Lets do that...Ctrl+C twice so you will come out of the shell and this time you run the command asElixir.Test.beam . Now the bytecode for the module Test is available in memory. Now you can access the documentation as follows...a is 97 and b is 98 hence it is listing out them as char_list. However you can tell the IO.inspect to list them as list itself with option char_lists: :as_list .iex and type h Inspect.Opts, you will see that Elixir does this kind of thing with other values as well, specifically structs and binaries.filename line function and others…pid function. This comes with two flavors.pid, then you can create one and test with it.pid = #PID<0.21.32> because # is considered as comment here.#PID<0.21.32> is treated as comment.String.replace function will replace the given the pattern with replacing pattern. By default, it replaces all the occurrences of the pattern. Lets check that…String.replace str, "@", "#"is same as String.replace str, "@", "#", global: trueglobal: false . So, it replaces only the first occurrence of @ . Lets check that…@ is replaced with #.:erlang.memory:erlang.memory :atom to get the memory usage of atoms.head and tail like [head | tail] . We can use the same principle for picking out the elements in the list like the following way…[maps] where you have to extract first_name of the each map, generally we go for enum . We can also achieve this by using the get_in and Access.all()get_in along with Access.all() , as the first value in the list of keys like above, the users datatype should be list. If you pass the map, it returns the error.nil for key which is not in the map.Access.all() and inside the list of keys [:books, Access.all(), :name], the value of the key :books should return the list, other wise it raises an error.for x <- [1, 2, 3], do: x + 1 . But we can also add the comprehension along with filter.