Elixir v1.3.4 Integer View Source
Functions for working with integers.
Link to this section Summary
Functions
Returns the ordered digits for the given non-negative integer
Determines if an integer is even
Determines if integer is odd
Parses a text representation of an integer
Returns a charlist which corresponds to the text representation of the given integer
Returns a charlist which corresponds to the text representation of integer in the given base
Returns a binary which corresponds to the text representation
of integer
Returns a binary which corresponds to the text representation
of integer in the given base
Returns the integer represented by the ordered digits
Link to this section Functions
digits(non_neg_integer, pos_integer) :: [non_neg_integer, ...]
Returns the ordered digits for the given non-negative integer.
An optional base value may be provided representing the radix for the returned
digits. This one can be an integer >= 2.
Examples
iex> Integer.digits(101)
[1, 0, 1]
iex> Integer.digits(170, 2)
[1, 0, 1, 0, 1, 0, 1, 0]Determines if an integer is even.
Returns true if the given integer is an even number,
otherwise it returns false.
Allowed in guard clauses.
Examples
iex> Integer.is_even(10)
true
iex> Integer.is_even(5)
false
iex> Integer.is_even(-10)
true
iex> Integer.is_even(0)
trueDetermines if integer is odd.
Returns true if the given integer is an odd number,
otherwise it returns false.
Allowed in guard clauses.
Examples
iex> Integer.is_odd(5)
true
iex> Integer.is_odd(6)
false
iex> Integer.is_odd(-5)
true
iex> Integer.is_odd(0)
falseparse(binary, 2..36) :: {integer, binary} | :error | no_return
Parses a text representation of an integer.
An optional base to the corresponding integer can be provided.
If base is not given, 10 will be used.
If successful, returns a tuple in the form of {integer, remainder_of_binary}.
Otherwise :error.
Raises an error if base is less than 2 or more than 36.
If you want to convert a string-formatted integer directly to a integer,
String.to_integer/1 or String.to_integer/2 can be used instead.
Examples
iex> Integer.parse("34")
{34, ""}
iex> Integer.parse("34.5")
{34, ".5"}
iex> Integer.parse("three")
:error
iex> Integer.parse("34", 10)
{34, ""}
iex> Integer.parse("f4", 16)
{244, ""}
iex> Integer.parse("Awww++", 36)
{509216, "++"}
iex> Integer.parse("fab", 10)
:error
iex> Integer.parse("a2", 38)
** (ArgumentError) invalid base 38Returns a charlist which corresponds to the text representation of the given integer.
Inlined by the compiler.
Examples
iex> Integer.to_charlist(123)
'123'
iex> Integer.to_charlist(+456)
'456'
iex> Integer.to_charlist(-789)
'-789'
iex> Integer.to_charlist(0123)
'123'to_charlist(integer, 2..36) :: charlist
Returns a charlist which corresponds to the text representation of integer in the given base.
base can be an integer between 2 and 36.
Inlined by the compiler.
Examples
iex> Integer.to_charlist(100, 16)
'64'
iex> Integer.to_charlist(-100, 16)
'-64'
iex> Integer.to_charlist(882681651, 36)
'ELIXIR'Returns a binary which corresponds to the text representation
of integer.
Inlined by the compiler.
Examples
iex> Integer.to_string(123)
"123"
iex> Integer.to_string(+456)
"456"
iex> Integer.to_string(-789)
"-789"
iex> Integer.to_string(0123)
"123"Returns a binary which corresponds to the text representation
of integer in the given base.
base can be an integer between 2 and 36.
Inlined by the compiler.
Examples
iex> Integer.to_string(100, 16)
"64"
iex> Integer.to_string(-100, 16)
"-64"
iex> Integer.to_string(882681651, 36)
"ELIXIR"undigits([integer], integer) :: integer
Returns the integer represented by the ordered digits.
An optional base value may be provided representing the radix for the digits.
This one can be an integer >= 2.
Examples
iex> Integer.undigits([1, 2, 3])
123
iex> Integer.undigits([1, 4], 16)
20
iex> Integer.undigits([])
0