Built-in Types
Bool
Boolean type. Bool has two possible values:
0B
and
1B
{…the main reason for rejection of true
and false
{…11l is not the only one programming language in which boolean values are not true
and false
: for example, PL/I uses '0'B
and '1'B
, in Objective-C the pair YES
/NO
is used, and in Scheme: #t
and #f
} is that keywords do not fit into the base concept of 11l — all root {…for example, L
— is a root keyword, and break
is a subkeyword} keywords can be shortened to one letter {…there is an option to do it with Bool values: take Y as Yes/true and O as nO/false/0, but this is even more ugly than 0B and 1B, and also then language should be renamed to 13l}}.
[Like in Boolean algebra, in which 0 and 1 are used.]
Int
Integral type (
32 or 64 bits).
To construct an integer from a string write
Int(s)
.
To construct an integer from a string in radix
base
write
Int(s, radix' base)
.
To construct an integer from an array of bytes write
Int(bytes' b)
for little-endian, and
Int(bytes_be' b)
for big-endian.
[For the reverse operation use built-in function bytes_from_int()
.]
Int8
Int16
Int32
Int64
or
Int1
Int2
Int4
Int8
Signed integers.
Byte
UInt16
UInt32
UInt64
Unsigned integers.
BigInt
Arbitrary-precision integer.
Float
Floating-point type (
32 or 64 bits).
Float32/
SFloat
Float64
or
Float4/
SFloat
Float8
Char
Character.
For example, this code creates a character with code 65:
Char(code' 65)
To create a character from single-digit integer number write this:
Char(digit' i)
To create a character from single character string write this:
Char(string' s)
(This differs from
s[0]
by throwing an error if length of
s
is greater than 1.)
To create a character from single character string literal write this:
Char("\0")
Members
code
Code of the character.
Methods
is_digit()
Return true (1B) if character is a digit.
is_alpha()
Return true (1B) if character is an alphabetic.
is_lowercase()
Return true (1B) if character is lowercase.
is_uppercase()
Return true (1B) if character is uppercase.
lowercase()
Return a copy of the character converted to lowercase.
uppercase()
Return a copy of the character converted to uppercase.
String
String type. Can be constructed from a
string literal. To construct a string from an integer in radix
base
write
String(i, radix' base)
.
Note: in contrast to Python, strings in 11l are mutable (like in C++).
Members
len
Length of the string in characters.
Methods
empty
Returns true (1B) if the string has no characters; otherwise returns false (0B). (This method is called without parentheses.)
last
A last character of the string. (This method is called without parentheses.)
starts_with(prefix)
Return true (1B) if the string starts with the
prefix
, otherwise return false (0B).
prefix
can also be a tuple of prefixes to look for.
ends_with(suffix)
Return true (1B) if the string ends with the specified
suffix
, otherwise return false (0B).
suffix
can also be a tuple of suffixes to look for.
count(sub)
Return the number of non-overlapping occurrences of substring
sub
.
is_digit()
Return true (1B) if all characters in the string are digits and there is at least one character, false (0B) otherwise.
is_alpha()
Return true (1B) if all characters in the string are alphabetic and there is at least one character, false (0B) otherwise.
find(sub, start = 0)
Return the lowest index in the string where substring
sub
is found. Search begins at
start
. Return
N
/
null
if
sub
is not found.
sub
can also be a tuple of strings to look for.
findi(sub, start = 0)
Return the lowest index in the string where substring
sub
is found. Search begins at
start
. Return
-1
if
sub
is not found.
rfind(sub
[, start])
Return the highest index in the string where substring
sub
is found. Search begins at
start
(if
start
is not specified, whole string will be searched). Return
N
/
null
if
sub
is not found.
rfindi(sub, start, end)
Return the highest index in the string where substring
sub
is found, such that
sub
is contained within
s[start.<end]
. Return
-1
if
sub
is not found.
replace(old, new)
Return a copy of the string with all occurrences of
old
replaced by
new
.
old
can be a regular expression.
lowercase()
Return a copy of the string with all the cased characters converted to lowercase.
uppercase()
Return a copy of the string with all the cased characters converted to uppercase.
capitalize()
Return a copy of the string with its first character capitalized.
zfill(width)
Return a copy of the string left filled with ASCII '0' digits to make a string of length
width
.
center(width, fillchar = ‘ ’)
Return centered in a string of length
width
. Padding is done using the specified
fillchar
.
ljust(width, fillchar = ‘ ’)
Return the string left justified in a string of length
width
. Padding is done using the specified
fillchar
.
rjust(width, fillchar = ‘ ’)
Return the string right justified in a string of length
width
. Padding is done using the specified
fillchar
.
split(delim, limit = N, group_delimiters = 0B)
Divides string into substrings based on a delimiter, returning an array of these substrings.
delim
can be a regular expression.
delim
can also be a tuple of characters (example:
s.split((‘ ’, "\t", "\n", "\r"))
). If
limit
is given, at most that number of fields will be returned (if
limit
is 1, the entire string is returned as the only entry in an array).
[limit
argument in 11l is similar to JavaScript, Ruby and PHP, but not Python.]
If
group_delimiters
is
0B
, consecutive delimiters are not grouped together and are deemed to delimit empty strings (for example,
‘1,,2’.split(‘,’)
returns
[‘1’, ‘’, ‘2’]
).
ltrim(string
[, limit])
Return a copy of the string with leading strings removed. At most
limit
strings are removed.
ltrim(tuple_of_chars
[, limit])
Return a copy of the string with leading characters removed. At most
limit
characters are removed.
rtrim(string
[, limit])
Return a copy of the string with trailing strings removed. At most
limit
strings are removed.
Example:
‘1.0.0’.rtrim(‘.0’, 1)
returns
‘1.0’
.
rtrim(tuple_of_chars
[, limit])
Return a copy of the string with trailing characters removed. At most
limit
characters are removed.
Example:
‘a.,’.rtrim((‘.’, ‘,’))
returns
‘a’
.
trim(string)
Return a copy of the string with leading and trailing strings removed.
trim(tuple_of_chars)
Return a copy of the string with leading and trailing characters removed.
format(args...)
Perform a string formatting operation. The string on which this method is called can contain literal text or replacement fields starting with
#
. Returns a copy of the string where each replacement field is replaced with the string value of the corresponding argument.
Format String Syntax
replacement_field ::= "#"["<"](width["."precision] | "."[precision])
width ::= digit+
precision ::= digit+
Examples:
| Replacement field | Argument | Output |
|---|
#4. | 40 | 40. |
#4 | 4 | 4 |
#4 | 1.2 | 1.2 |
#04 | 1.2 | 01.2 |
#. | 1.234 | 1.234 |
#.6 | 1.234 | 1.234000 |
#2.6 | 1.234 | 1.234000 |
#2.2 | 1.234 | 1.23 |
#2.2 | -1.234 | -1.23 |
#2 | 1 | 1 |
#5 | abc | abc |
#. | abc | abc |
#<5. | abc | abc . |
That's like rule ###.. | 1 | That's like rule #1. |
Tuple
A tuple. For example, a tuple with two items:
(1, 2)
.
[Type of this tuple is (Int, Int)
or Tuple[Int, Int]
.]
The elements of tuples consisting of from 2 to 4 elements of the same arithmetic type can be accessed by
x
,
y
,
z
,
w
or
r
,
g
,
b
,
a
.
Arithmetic operations (
+
,
-
,
*
,
/
) on tuples are performed componentwise
{…for example, (x1, y1, z1) + (x2, y2, z2)
will give the following tuple: (x1 + x2, y1 + y2, z1 + z2)
{…and (x, y, z) * 2
will give (x*2, y*2, z*2)
}}.
Note 1: like in mypy, tuples in 11l are heterogeneous, but arrays (analogue of Python's lists) are homogeneous.
Note 2: in contrast to Python, tuples in 11l are mutable (like in C++).
Array
An array. For example, an array with two items:
[1, 2]
.
[Type of this array is [Int]
or Array[Int]
.]
Members
len
Length of an array.
Methods
empty
Returns true (1B) if the array has no elements; otherwise returns false (0B). (This method is called without parentheses.)
last
A last element of the array. (This method is called without parentheses.)
join(sep)
Return a string which is the concatenation of the strings in an array.
sep
is the separator between elements.
map(function)
Applies
function
to every item of an array and return that new array.
filter(function)
Return a new array consisting of those elements from this array for which
function
returns true (1B).
reduce(
[initial,] function)
Apply
function
of two arguments cumulatively to the items of the array, from left to right, so as to reduce the array to a single value. For example,
[1, 2, 3].reduce((x, y) -> x + y)
calculates
((1+2)+3)
. If the optional
initial
is present, it is placed before the items of the array in the calculation, and serves as a default when the array is empty.
[Note that order of the arguments is the same as in Java, in Swift and in Rust, but not in Python.]
append(new_element)
Appends
new_element
to the end of this array.
append(arr)
Appends all elements of
arr
to the end of this array.
append(range)
Append all values of
range
to the end of this array. Example:
{…
V arr = [-1]
arr.append(1..3)
print(arr)
}
arr [+]= x
The same as
arr.append(x)
.
pop()
Retrieves the last item of this array and also removes it.
index(x, start = 0)
Return index of the first occurrence of
x
in this array (at or after index
start
).
ValueError
is raised when
x
is not found in this array.
find(x, start = 0)
Return index of the first occurrence of
x
in this array (at or after index
start
), or
N
/
null
if
x
is not found in this array.
x
can also be a tuple of values to look for.
count(x)
Return total number of occurrences of
x
in this array.
sort()
This method sorts the array in place, using only
<
comparisons between items.
sort_range(range)
This method sorts the specified range of an array in place.
reverse()
Reverses the items of array in place.
Dict
A dictionary. For example, a dictionary with two items:
[‘key1’ = 1, ‘key2’ = 2]
.
[Type of this dictionary is [String = Int]
or Dict[String, Int]
.]
Methods
empty
Returns true (1B) if the dictionary has no items; otherwise returns false (0B). (This method is called without parentheses.)
find(key) -> ValueType?
Finds element with specific key. If no such element is found,
N
/
null
is returned.
get(key, default) -> ValueType
Return the value for
key
if
key
is in the dictionary, else
default
.
keys()
Return an array of the dictionary's keys.
values()
Return an array of the dictionary's values.
filter(function)
Return an array consisting of those elements of dictionary for which
function
returns true (1B).
DefaultDict
A dictionary, which does not throw an exception when accessing a non-existent key (it inserts a new item with a default value in this case).
For example, a default dictionary with two items:
DefaultDict([‘key1’ = 1, ‘key2’ = 2])
.
[Type of this dictionary is DefaultDict[String, Int]
.]
Set
A set. For example, a set with two items:
Set([1, 2])
.
[Type of this set is Set[Int]
.]
Methods
empty
Returns true (1B) if the set has no elements; otherwise returns false (0B). (This method is called without parentheses.)
add(elem)
Add element
elem
to the set.
remove(elem)
Remove element
elem
from the set. Raises
KeyError
if
elem
is not contained in the set.
clear()
Remove all elements from the set.
difference(other)
Return a new set with elements in the set that are not in the
other
.
lower_bound(key) -> KeyType?
Returns the first element which is not less than the given
key
. If no such element is found,
N
/
null
is returned.
upper_bound(key) -> KeyType?
Returns the first element which is greater than the given
key
. If no such element is found,
N
/
null
is returned.
Deque
A double-ended queue. For example, a deque with two items:
Deque([1, 2])
.
[Type of this deque is Deque[Int]
.]
Methods
empty
Returns true (1B) if the queue has no items; otherwise returns false (0B). (This method is called without parentheses.)
append(x)
Add
x
to the right side of the deque.
append_left(x)
Add
x
to the left side of the deque.
clear()
Remove all elements from the deque leaving it with length 0.
extend(iterable)
Extend the right side of the deque by appending elements from the iterable argument.
extend_left(iterable)
Extend the left side of the deque by appending elements from
iterable
.
index(x, start = 0)
Return the position of
x
in the deque (at or after index
start
). Returns the first match or raises
ValueError
if not found.
insert(i, x)
Insert
x
into the deque at position
i
.
pop()
Remove and return an element from the right side of the deque. If no elements are present, raises an
IndexError
.
pop_left()
Remove and return an element from the left side of the deque. If no elements are present, raises an
IndexError
.
remove(value)
Remove the first occurrence of
value
. If not found, raises a
ValueError
.
File
A file object.
Methods
File(name, mode = ‘r’)
Open file with the specified name and mode (
note: only ‘r’ and ‘w’ are supported at the present moment).
read() -> String
Read a whole file into a string, and return it.
Note: only UTF-8 encoding [with optional BOM] is supported at the present moment.
read(1) -> Char
Read and return single character from the file.
read_line(keep_newline = 0B) -> String
Read and return one line from the file. If
keep_newline
argument is true (1B), trailing new-line character is left as is.
read_lines(keep_newline = 0B) -> Array
[String]
Reads the entire file as individual lines, and returns those lines in an array. If
keep_newline
argument is true (1B), trailing new-line characters are left as is.
read_bytes() -> Array[Byte]
Read a whole file into an array of bytes, and return it.
read_bytes(size) -> Array[Byte]
Read up to
size
bytes from the file and return them.
write(s)
Write the string
s
to the file.
write_bytes(Array[Byte] bytes)
Write bytes to the file.
flush()
Flush the write buffers of the file.