Before all, this post it aims to share and learn a new programming language ( called Elixir) and new knowledges about functional programming world.Like any begin in any programming language, it important start learn about syntax
and the basic data types
. So, let's go!
just wait a little longer, I swear it will be important
.I need talk about print to the console in Elixir.
Console
If you are running on Windows, there is a chance your terminal does not use UTF-8 by default. You can change the encoding of your current session by running chcp 65001
before entering IEx.
Basicaly, exists two way for print to console in Elixir :
IO.puts
: requires the argument to be either a string, or a struct that implements the String.Chars protocol.
IO.inspect
: can print an arbitrary elixir term, like a list of strings.
ok, now let's go!
Integer
Represent numbers without floating point.These are the methods of this kind :
sum
sum = 7 + 1
IO.puts(sum)
output : 8
division ( div( ) )
division = div(9,2)
IO.puts(division)
output : 4
# the div() method will always take integers as parameters and return integer values.
rem ( division remainder )
remMethod = rem(10,3)
IO.puts remMethod
output : 1
# Elixir allows you to drop the parentheses when invoking named function.
subtraction
sub = 9-18
IO.puts sub
output : -9
You can use is_integer() method to verify if a value is integer
isOrNotInteger = "9"
IO.puts is_integer(isOrNotInteger)
output : false
Binary, Octal and Hexadecimal
binary
: begins with 0b
octal
: begins with 0o
hex
: begins with 0x
bin = 0b1010
octal = 0o666
hex = 0x1D
Both binary, octal and hexadecimal types allow the use of the is_integer () method. If you use IO.puts, you can represent these values ββin decimal basis.
IO.puts is_integer(bin)
IO.puts is_integer(octal)
IO.puts is_integer(hex)
output :
true
true
true
IO.puts (bin)
IO.puts (octal)
IO.puts (hex)
output :
10
438
29
Float
Represent numbers with floating point
sum
sum = 12.0 + 1
IO.puts(sum)
output : 13.0
# note that if you have an operation that has a floating point number, the end result will be a float.
subtraction
sub = 12.01 - 7.89
IO.puts(sub)
output : 4.12
division ( / )
div = 9/2
IO.puts(div)
output : 4.5
# note that it's allow use integers in operator / , but always return a float number.
rem method does not work with floating point numbers
IO.puts( rem(12.9,2) )
output :
(ArithmeticError) bad argument in arithmetic expression: rem(12.9, 2)
Booleans
Elixir basicaly have two values for represent booelans values, true
and false
IO.puts true
IO.puts false
IO.puts false == false
output :
true
false
true
Atom
An atom is a constant whose value is its own name, like Symbols
in others languages. Often they are used to express the state of an operation.
If you enter in Interative mode ( run iex ), after the end of a successful operation, an :ok
is always returned.
iex(1)> IO.puts "atoms"
atoms
:ok
Elixir allows you to skip the leading :
for the atoms : nil
, false
, true
IO.puts :nil == nil
IO.puts :false == false
IO.puts :true == true
output :
true
true
true
IO.puts :elixir == "elixir"
IO.puts :elixir == :elixir
output :
false
true
String
Strings in Elixir are delimited by double quotes, and they are encoded in UTF-8.The String module contains a bunch of functions that operate on strings, see in HexDocs.
Strings are represented internally by binaries which are sequences of bytes. Single quotes aren't represented like binaries.
doubleQuotes = "DEV"
singleQuotes = 'DEV'
IO.puts is_binary(doubleQuotes)
IO.puts is_binary(singleQuotes)
output :
true
false
concatenation
Unlike some languages, elixir does not allow the +
operator to join strings, in this case, we use <>
IO.puts "DEV" + "Community"
output :
(ArithmeticError) bad argument in arithmetic expression: "DEV" + "Community"
IO.puts "DEV" <> "Community"
output :
"DEVCommunity"
string interpolation
Elixir allow you to use string interpolation
world = :world
IO.puts "hello #{world}"
output :
hello world
break line and multiple lines
# use \n for break line
IO.puts "hello\nworld"
output :
hello
world
# multiple lines
multiLine = "
breathe
think
continues"
IO.puts multiLine
output :
breathe
think
continues
preview of some methods
dev = "DEV"
IO.puts is_binary dev
IO.puts byte_size dev
IO.puts String.length dev
output :
true
3
3
split = String.split("Led Zeppelin", " ")
IO.inspect split
output :
["Led", "Zeppelin"]
It was a pleasure learning and writing a little about Elixir, any questions or criticism, please comment below
π€ π€ π€
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