Introduction

Interactive mode: iex

Initial Commands:

iex> 40 + 2
42
iex> "hello" <> " world"
"hello world"
iex> 40 + 2
42
iex> "hello" <> " world"
"hello world"

Running Scripts: elixir hello-word.exs

Hello Word:

IO.puts "Hello Word"
IO.puts "Hello Word"
"Hello Word"
"Hello Word"

Basic types

Get Data Type: i data

iex> i 1
iex> i 1

will show something like this:

Term
  1
Data type
  Integer
Reference modules
  Integer
Implemented protocols
  IEx.Info, Inspect, List.Chars, String.Chars

Basic Types

iex> 1          # integer
iex> 0x1F       # integer
iex> 1.0        # float
iex> true       # boolean
iex> :atom      # atom / symbol
iex> "elixir"   # string
iex> [1, 2, 3]  # list
iex> {1, 2, 3}  # tuple
iex> 1          # integer
iex> 0x1F       # integer
iex> 1.0        # float
iex> true       # boolean
iex> :atom      # atom / symbol
iex> "elixir"   # string
iex> [1, 2, 3]  # list
iex> {1, 2, 3}  # tuple

Math

iex> 1 + 2
3
iex> 5 * 5
25
iex> 10 / 2
5.0
iex> 1 + 2
3
iex> 5 * 5
25
iex> 10 / 2
5.0

10/2 always return a float number, to get an integer, use div and rem functions:

iex> div(10, 2)
5
iex> div 10, 2
5
iex> rem 10, 3
1
iex> div(10, 2)
5
iex> div 10, 2
5
iex> rem 10, 3
1

Shortcut Notations

iex> 0b1010 # binary
10
iex> 0o777 # octal
511
iex> 0x1F # hexadecimal
31
iex> 0b1010 # binary
10
iex> 0o777 # octal
511
iex> 0x1F # hexadecimal
31

Scientific Notation

iex> 1.0
1.0
iex> 1.0e-10
1.0e-10
iex> 1.0
1.0
iex> 1.0e-10
1.0e-10

Round Function

iex> round(3.58)
4
iex> trunc(3.58)
3
iex> round(3.58)
4
iex> trunc(3.58)
3