FEEL built-in functions

To promote interoperability, FEEL includes a library of built-in functions, described below. The built-in functions are implemented and available to be used in the Drools DMN engine; this document provides and overall description and helpful examples. The formal specification of these functions can be referenced in the original DMN Specification document from OMG.

Conversion functions

These functions support conversion between values of different types. Some specific string formats are used, such as:

  • date string as specified by XML Schema Part 2 Datatypes, for example 2020-06-01

  • time string either

    • as specified by XML Schema Part 2 Datatypes, for example 23:59:00z

    • a local time as specified by ISO 8601 followed by @ and a IANA Timezone, for example 00:01:00@Etc/UTC

  • date time string a composite of a date string followed by T and a time string, for example 2012-12-25T11:00:00Z

  • duration string as a date time duration or year month duration as specified by the XQuery 1.0 and XPath 2.0 Data Model, for example P1Y2M

date(from)

Convert from to a date.

Parameters

  • from of type string of date string format

Examples
date("2012-12-25") - date("2012-12-24") = duration("P1D")

date(from)

Convert from to a date, setting time components to null.

Parameters

  • from of type date and time

Examples
date(date and time("2012-12-25T11:00:00Z")) = date("2012-12-25")

date(year, month, day)

Produce a date from year, month and day values.

Parameters

  • year of type number

  • month of type number

  • day of type number

Examples
date(2012, 12, 25) = date("2012-12-25")

date and time(date, time)

Produce a date and time from the given date ignoring any time components and the given time.

Parameters

  • date of type date or date and time

  • time of type time

Examples
date and time ("2012-12-24T23:59:00") = date and time(date("2012-12-24"), time("23:59:00"))

date and time(from)

Produce a date and time from the given string.

Parameters

  • from of type string of date time string format

Examples
date and time("2012-12-24T23:59:00") + duration("PT1M") = date and time("2012-12-25T00:00:00")

time(from)

Produce a time from the given string.

Parameters

  • from of type string of time string format

Examples
time("23:59:00z") + duration("PT2M") = time("00:01:00@Etc/UTC")

time(from)

Produce a time from the given parameter, ignoring any date components

Parameters

  • from of type time or date and time

Examples
time(date and time("2012-12-25T11:00:00Z")) = time("11:00:00Z")

time(hour, minute, second, offset?)

Produce a time from the given hour, minute and second component values

Parameters

  • hour of type number

  • minute of type number

  • second of type number

  • offset and optional parameter of type days and time duration or null

Examples
time("23:59:00z") = time(23, 59, 0, duration("PT0H"))

number(from, grouping separator, decimal separator)

Converts from into a number using the specified separators.

Parameters

  • from of type string representing a valid number

  • grouping separator one of space (` ) or comma (,) or period (.`) or null

  • decimal separator as above, but different from the group separator, or also null

Examples
number("1 000,0", " ", ",") = number("1,000.0", ",", ".")

string(from)

Provide a string representation of the supplied parameter.

Parameters

  • from a non-null value

Examples
string(1.1) = "1.1"
string(null) = null

duration(from)

Convert from to a days and time or years and months duration.

Parameters

  • from of type string of duration string format

Examples
date and time("2012-12-24T23:59:00") - date and time("2012-12-22T03:45:00") = duration("P2DT20H14M")
duration("P2Y2M") = duration("P26M")

years and months duration(from, to)

Calculate the years and months duration between the two supplied parameters

Parameters

  • from of type date or date and time

  • to same type as above

Examples
years and months duration( date("2011-12-22"), date("2013-08-24") ) = duration("P1Y8M")

Boolean functions

Function for Boolean operations.

not(negand)

Perform the logical negation of the negand operand.

Parameters

  • negand of type boolean

Examples
not(true) = false
not(null) = null

String functions

Functions for string operations.

Note
 in FEEL, Unicode characters are counted using their codepoints.

substring(string, start position, length?)

Returns the substring from start position for the given length; the first character is at position value 1.

Parameters

  • string of type string

  • start position of type number

  • length optional parameter of type number

Examples
substring("foobar",3) = "obar"
substring("foobar",3,3) = "oba"
substring("foobar", -2, 1) = "a"
substring("\U01F40Eab", 2) = "ab"
Note
 in FEEL the string literal "\U01F40Eab" is the 🐎ab string

string length(string)

Calculates the length of the string

Parameters

  • string of type string

Examples
string length("foo") = 3
string length("\U01F40Eab") = 3

upper case(string)

Produce an upper case version of the string

Parameters

  • string of type string

Examples
upper case("aBc4") = "ABC4"

lower case(string)

Produce an lower case version of the string

Parameters

  • string of type string

Examples
lower case("aBc4") = "abc4"

substring before(string, match)

Calculates the substring before the match

Parameters

  • string of type string

  • match of type string

Examples
substring before("foobar", "bar") = "foo"
substring before("foobar", "xyz") = ""

substring after(string, match)

Calculates the substring after the match

Parameters

  • string of type string

  • match of type string

Examples
substring after("foobar", "ob") = "ar"
substring after("", "a") = ""

replace(input, pattern, replacement, flags?)

Calculates the regular expression replacement

Parameters

  • input of type string

  • pattern of type string

  • replacement of type string

  • flags optional parameter of type string

Note
 uses regular expression parameters as defined in XQuery 1.0 and XPath 2.0
Examples
replace("abcd", "(ab)|(a)", "[1=$1][2=$2]") = "[1=ab][2=]cd"

contains(string, match)

Returns true if the string contains the match

Parameters

  • string of type string

  • match of type string

Examples
contains("foobar", "of") = false

starts with(string, match)

Returns true if the string starts with the match

Parameters

  • string of type string

  • match of type string

Examples
starts with("foobar", "fo") = true

ends with(string, match)

Returns true if the string ends with the match

Parameters

  • string of type string

  • match of type string

Examples
ends with("foobar", "r") = true

matches(input, pattern, flags?)

Returns true if the input matches the regular expression

Parameters

  • input of type string

  • pattern of type string

  • flags optional parameter of type string

Note
 uses regular expression parameters as defined in XQuery 1.0 and XPath 2.0
Examples
matches("foobar", "^fo*b") = true

split(string, delimiter)

Returns a list of the original string, splitted at the delimiter regexp pattern.

Parameters

  • string of type string

  • delimiter of type string for a regular expression pattern

Note
 uses regular expression parameters as defined in XQuery 1.0 and XPath 2.0
Examples
split( "John Doe", "\\s" ) = ["John", "Doe"]
split( "a;b;c;;", ";" ) = ["a","b","c","",""]

List functions

Functions for list operations.

Note
 in FEEL, the index of the first elements in a list is 1, the index of the last element in a list cab also be identified as -1.

list contains(list, element)

Returns true if the list contains the element

Parameters

  • list of type list

  • element of any type, including null

Examples
list contains([1,2,3], 2) = true

count(list)

Counts the element in the list

Parameters

  • list of type list

Examples
count([1,2,3]) = 3
count([]) = 0
count([1,[2,3]]) = 2

min(list)

Returns the minimum comparable element in the list

Parameters

  • list of type list

Alternative signature
min(e1, e2, ..., eN)
Examples
min([1,2,3]) = 1
min(1) = 1
min([1]) = 1

max(list)

Returns the maximum comparable element in the list

Parameters

  • list of type list

Alternative signature
max(e1, e2, ..., eN)
Examples
max(1,2,3) = 3
max([]) = null

sum(list)

Returns the sum of the numbers in the list

Parameters

  • list of type list of number elements

Alternative signature
sum(n1, n2, ..., nN)
Examples
sum([1,2,3]) = 6
sum(1,2,3) = 6
sum(1) = 1
sum([]) = null

mean(list)

Calculates the average (arithmetic mean) of the element in the list

Parameters

  • list of type list of number elements

Alternative signature
mean(n1, n2, ..., nN)
Examples
mean([1,2,3]) = 2
mean(1,2,3) = 2
mean(1) = 1
mean([]) = null

all(list)

Returns true if and only if all elements in the list are true

Parameters

  • list of type list of boolean elements

Alternative signature
all(b1, b2, ..., bN)
Examples
all([false,null,true]) = false
all(true) = true
all([true]) = true
all([]) = true
all(0) = null

any(list)

Returns true if any of the elements in the list is true

Parameters

  • list of type list of boolean elements

Alternative signature
any(b1, b2, ..., bN)
Examples
any([false,null,true]) = true
any(false) = false
any([]) = false
any(0) = null

sublist(list, start position, length?)

Returns the sublist from start position, limited to length elements

Parameters

  • list of type list

  • start position of type number

  • length an optional parameter of type number

Examples
sublist([4,5,6], 1, 2) = [4,5]

append(list, item…​)

Creates a list appended with the item(s)

Parameters

  • list of type list

  • item parameters of any type

Examples
append([1], 2, 3) = [1,2,3]

concatenate(list…​)

Creates a list which is the result of the concatenated lists

Parameters

  • list parameters of type list

Examples
concatenate([1,2],[3]) = [1,2,3]

insert before(list, position, newItem)

Creates a list with the newItem inserted at the specified position

Parameters

  • list of type list

  • position of type number

  • newItem of any type

Examples
insert before([1,3],1,2) = [2,1,3]

remove(list, position)

Creates a list which the removed element from the specified position

Parameters

  • list of type list

  • position of type number

Examples
remove([1,2,3], 2) = [1,3]

reverse(list)

Returns a reversed list

Parameters

  • list of type list

Examples
reverse([1,2,3]) = [3,2,1]

index of(list, match)

Returns indexes matching the element

Parameters

  • list of type list

  • match of any type

Examples
index of([1,2,3,2],2) = [2,4]

union(list…​)

Returns a list of all the elements from the lists without duplicates

Parameters

  • list parameters of type list

Examples
union([1,2],[2,3]) = [1,2,3]

distinct values(list)

Returns a list without duplicates

Parameters

  • list of type list

Examples
distinct values([1,2,3,2,1]) = [1,2,3]

flatten(list)

Returns a flattened list

Parameters

  • list of type list

Examples
flatten([[1,2],[[3]], 4]) = [1,2,3,4]

product(list)

Returns the product of the numbers in the list

Parameters

  • list of type list of number elements

Alternative signature
product(n1, n2, ..., nN)
Examples
product([2, 3, 4]) = 24
product(2, 3, 4) = 24

median( list )

Returns the median of the numbers in the list. After sorting the elements, in the case of an odd number of elements, the result is the middle element; in the case of even number of elements, the result is the average of the two middle elements.

Parameters

  • list of type list of number elements

Alternative signature
median(n1, n2, ..., nN)
Examples
median( 8, 2, 5, 3, 4 ) = 4
median( [6, 1, 2, 3] ) = 2.5
median( [ ] ) = null

stddev( list )

Returns the sample standard deviation of the numbers in the list.

Parameters

  • list of type list of number elements

Alternative signature
stddev(n1, n2, ..., nN)
Examples
stddev( 2, 4, 7, 5 ) = 2.081665999466132735282297706979931
stddev( [ 47 ] ) = null
stddev( 47 ) = null
stddev( [ ] ) = null

mode( list )

Returns the mode of the numbers in the list; in case of multiple elements, these are returned in their ascending order.

Parameters

  • list of type list of number elements

Alternative signature
mode(n1, n2, ..., nN)
Examples
mode( 6, 3, 9, 6, 6 ) = [ 6 ]
mode( [6, 1, 9, 6, 1] ) = [ 1, 6 ]
mode( [ ] ) = [ ]

Numeric functions

Functions for number operations.

decimal(n, scale)

Returns number with the given scale

Parameters

  • n of type number

  • scale of any number in the range ` [−6111..6176]`

Examples
decimal(1/3, 2) = .33
decimal(1.5, 0) = 2
decimal(2.5, 0) = 2

floor(n)

Returns the greatest integer less or equal to the number

Parameters

  • n of type number

Examples
floor(1.5) = 1
floor(-1.5) = -2

ceiling(n)

Returns the smallest integer greater or equal to the number

Parameters

  • n of type number

Examples
ceiling(1.5) = 2
ceiling(-1.5) = -1

abs(n)

Returns the absolute value

Parameters

  • n of type number, days and time duration or year and month duration

Examples
abs( 10 ) = 10
abs( -10 ) = 10
abs(@"PT5H") = @"PT5H"
abs(@"-PT5H") = @"PT5H"

modulo( dividend, divisor )

Returns the remainder of the division of the dividend by divisor. In the case either dividend or divisor is negative, the result will be of the same sign as the divisor.

Note
 this can be equivalently be exprssed as: modulo(dividend, divisor) = dividend - divisor*floor(dividen d/divisor).
Parameters

  • dividend of type number

  • divisor of type number

Examples
modulo( 12, 5 ) = 2
modulo(-12,5)= 3
modulo(12,-5)= -3
modulo(-12,-5)= -2
modulo(10.1, 4.5)= 1.1
modulo(-10.1, 4.5)= 3.4
modulo(10.1, -4.5)= -3.4
modulo(-10.1, -4.5)= -1.1

sqrt( number )

Returns the square root of the number

Parameters

  • n of type number

Examples
sqrt( 16 ) = 4

log( number )

Returns the natural logarithm of the number

Parameters

  • n of type number

Examples
decimal( log( 10 ), 2 ) = 2.30

exp( number )

Returns the Euler’s number e raised to the power of the number

Parameters

  • n of type number

Examples
decimal( exp( 5 ), 2 ) = 148.41

odd( number )

Returns true if the number is odd

Parameters

  • n of type number

Examples
odd( 5 ) = true
odd( 2 ) = false

odd( number )

Returns true if the number is even

Parameters

  • n of type number

Examples
even( 5 ) = false
even ( 2 ) = true

Date and time functions

Functions for date and time specific operations.

is(value1, value2)

Returns true if both values are the same element in the FEEL semantic domain

Parameters

  • value1 of any type

  • value2 of any type

Examples
is(date("2012-12-25"), time("23:00:50")) = false
is(date("2012-12-25"), date("2012-12-25")) = true
is(time("23:00:50z"), time("23:00:50")) = false

Range functions

Temporal ordering functions to establish relationships between single scalar values and ranges of such values. These functions are heavily inspired by their equivalent in the HL7 CQL (Clinical Quality Language) standard version 1.4.

before()

A before B

Signatures

  1. before(point1 point2)

  2. before(point range)

  3. before(range point)

  4. before(range1,range2)

Evaluates to true if and only if

  1. point1 < point2

  2. point < range.start or (point = range.start and not(range.start included) )

  3. range.end < point or (range.end = point and not(range.end included) )

  4. range1.end < range2.start or not(range1.end included) or not(range2.start included and range1.end = range2.start)

Examples
before( 1, 10 ) = true
before( 10, 1 ) = false
before( 1, [1..10] ) = false
before( 1, (1..10] ) = true
before( 1, [5..10] ) = true
before( [1..10], 10 ) = false
before( [1..10), 10 ) = true
before( [1..10], 15 ) = true
before( [1..10], [15..20] ) = true
before( [1..10], [10..20] ) = false
before( [1..10), [10..20] ) = true
before( [1..10], (10..20] ) = true

after()

A after B

Signatures

  1. after(point1 point2)

  2. after(point range)

  3. after(range, point)

  4. after(range1 range2)

Evaluates to true if and only if

  1. point1 > point2

  2. point > range.end or (point = range.end and not(range.end included) )

  3. range.start > point or (range.start = point and not(range.start included) )

  4. range1.start > range2.end or (( not(range1.start included) or not(range2.end included) ) and range1.start = range2.end)

Examples
after( 10, 5 ) = true
after( 5, 10 ) = false
after( 12, [1..10] ) = true
after( 10, [1..10) ) = true
after( 10, [1..10] ) = false
after( [11..20], 12 ) = false
after( [11..20], 10 ) = true
after( (11..20], 11 ) = true
after( [11..20], 11 ) = false
after( [11..20], [1..10] ) = true
after( [1..10], [11..20] ) = false
after( [11..20], [1..11) ) = true
after( (11..20], [1..11] ) = true

meets()

A meets B

Signatures

  1. meets(range1, range2)

Evaluates to true if and only if

  1. range1.end included and range2.start included and range1.end = range2.start

Examples
meets( [1..5], [5..10] ) = true
meets( [1..5), [5..10] ) = false
meets( [1..5], (5..10] ) = false
meets( [1..5], [6..10] ) = false

met by()

A met by B

Signatures

  1. met by(range1, range2)

Evaluates to true if and only if

  1. range1.start included and range2.end included and range1.start = range2.end

Examples
met by( [5..10], [1..5] ) = true
met by( [5..10], [1..5) ) = false
met by( (5..10], [1..5] ) = false
met by( [6..10], [1..5] ) = false

overlaps()

A overlaps B

Signatures

  1. overlaps(range1, range2)

Evaluates to true if and only if

  1. (range1.end > range2.start or (range1.end = range2.start and (range1.end included or range2.end included))) and (range1.start < range2.end or (range1.start = range2.end and range1.start included and range2.end included))

Examples
overlaps( [1..5], [3..8] ) = true
overlaps( [3..8], [1..5] ) = true
overlaps( [1..8], [3..5] ) = true
overlaps( [3..5], [1..8] ) = true
overlaps( [1..5], [6..8] ) = false
overlaps( [6..8], [1..5] ) = false
overlaps( [1..5], [5..8] ) = true
overlaps( [1..5], (5..8] ) = false
overlaps( [1..5), [5..8] ) = false
overlaps( [1..5), (5..8] ) = false
overlaps( [5..8], [1..5] ) = true
overlaps( (5..8], [1..5] ) = false
overlaps( [5..8], [1..5) ) = false
overlaps( (5..8], [1..5) ) = false

overlaps before()

A overlaps before B

Signatures

  1. overlaps before(range1 range2)

Evaluates to true if and only if

  1. (range1.start < range2.start or (range1.start = range2.start and range1.start included and range2.start included)) and (range1.end > range2.start or (range1.end = range2.start and range1.end included and range2.start included)) and (range1.end < range2.end or (range1.end = range2.end and (not(range1.end included) or range2.end included )))

Examples
overlaps before( [1..5], [3..8] ) = true
overlaps before( [1..5], [6..8] ) = false
overlaps before( [1..5], [5..8] ) = true
overlaps before( [1..5], (5..8] ) = false
overlaps before( [1..5), [5..8] ) = false
overlaps before( [1..5), (1..5] ) = true
overlaps before( [1..5], (1..5] ) = true
overlaps before( [1..5), [1..5] ) = false
overlaps before( [1..5], [1..5] ) = false

overlaps after()

A overlaps after B

Signatures

  1. overlaps after(range1 range2)

Evaluates to true if and only if

  1. (range2.start < range1.start or (range2.start = range1.start and range2.start included and not( range1.start included))) and (range2.end > range1.start or (range2.end = range1.start and range2.end included and range1.start included )) and (range2.end < range1.end or (range2.end = range1.end and (not(range2.end included) or range1.end included)))

Examples
overlaps after( [3..8], [1..5] )= true
overlaps after( [6..8], [1..5] )= false
overlaps after( [5..8], [1..5] )= true
overlaps after( (5..8], [1..5] )= false
overlaps after( [5..8], [1..5) )= false
overlaps after( (1..5], [1..5) )= true
overlaps after( (1..5], [1..5] )= true
overlaps after( [1..5], [1..5) )= false
overlaps after( [1..5], [1..5] )= false
overlaps after( (1..5), [1..5] )= false
overlaps after( (1..5], [1..6] )= false
overlaps after( (1..5], (1..5] )= false
overlaps after( (1..5], [2..5] )= false

finishes()

A finishes B

Signatures

  1. finishes(point, range)

  2. finishes(range1, range2)

Evaluates to true if and only if

  1. range.end included and range.end = point

  2. range1.end included = range2.end included and range1.end = range2.end and (range1.start > range2.start or (range1.start = range2.start and (not(range1.start included) or range2.start included)))

Examples
finishes( 10, [1..10] ) = true
finishes( 10, [1..10) ) = false
finishes( [5..10], [1..10] ) = true
finishes( [5..10), [1..10] ) = false
finishes( [5..10), [1..10) ) = true
finishes( [1..10], [1..10] ) = true
finishes( (1..10], [1..10] ) = true

finished by()

A finished by B

Signatures

  1. finished by(range, point)

  2. finished by(range1 range2)

Evaluates to true if and only if

  1. range.end included and range.end = point

  2. range1.end included = range2.end included and range1.end = range2.end and (range1.start < range2.start or (range1.start = range2.start and (range1.start included or not(range2.start included))))

Examples
finished by( [1..10], 10 ) = true
finished by( [1..10), 10 ) = false
finished by( [1..10], [5..10] ) = true
finished by( [1..10], [5..10) ) = false
finished by( [1..10), [5..10) ) = true
finished by( [1..10], [1..10] ) = true
finished by( [1..10], (1..10] ) = true

includes()

A includes B

Signatures

  1. includes(range, point)

  2. includes(range1, range2)

Evaluates to true if and only if

  1. (range.start < point and range.end > point) or (range.start = point and range.start included) or (range.end = point and range.end included)

  2. (range1.start < range2.start or (range1.start = range2.start and (range1.start included or not(range2.start included)))) and (range1.end > range2.end or (range1.end = range2.end and (range1.end included or not(range2.end included))))

Examples
includes( [1..10], 5 ) = true
includes( [1..10], 12 ) = false
includes( [1..10], 1 ) = true
includes( [1..10], 10 ) = true
includes( (1..10], 1 ) = false
includes( [1..10), 10 ) = false
includes( [1..10], [4..6] ) = true
includes( [1..10], [1..5] ) = true
includes( (1..10], (1..5] ) = true
includes( [1..10], (1..10) ) = true
includes( [1..10), [5..10) ) = true
includes( [1..10], [1..10) ) = true
includes( [1..10], (1..10] ) = true
includes( [1..10], [1..10] ) = true

during()

A during B

Signatures

  1. during(point, range)

  2. during(range1 range2)

Evaluates to true if and only if

  1. (range.start < point and range.end > point) or (range.start = point and range.start included) or (range.end = point and range.end included)

  2. (range2.start < range1.start or (range2.start = range1.start and (range2.start included or not(range1.start included)))) and (range2.end > range1.end or (range2.end = range1.end and (range2.end included or not(range1.end included))))

Examples
during( 5, [1..10] ) = true
during( 12, [1..10] ) = false
during( 1, [1..10] ) = true
during( 10, [1..10] ) = true
during( 1, (1..10] ) = false
during( 10, [1..10) ) = false
during( [4..6], [1..10] ) = true
during( [1..5], [1..10] ) = true
during( (1..5], (1..10] ) = true
during( (1..10), [1..10] ) = true
during( [5..10), [1..10) ) = true
during( [1..10), [1..10] ) = true
during( (1..10], [1..10] ) = true
during( [1..10], [1..10] ) = true

starts()

A starts B

Signatures

  1. starts(point, range)

  2. starts(range1, range2)

Evaluates to true if and only if

  1. range.start = point and range.start included

  2. range1.start = range2.start and range1.start included = range2.start included and (range1.end < range2.end or (range1.end = range2.end and (not(range1.end included) or range2.end included)))

Examples
starts( 1, [1..10] ) = true
starts( 1, (1..10] ) = false
starts( 2, [1..10] ) = false
starts( [1..5], [1..10] ) = true
starts( (1..5], (1..10] ) = true
starts( (1..5], [1..10] ) = false
starts( [1..5], (1..10] ) = false
starts( [1..10], [1..10] ) = true
starts( [1..10), [1..10] ) = true
starts( (1..10), (1..10) ) = true

started by()

A started by B

Signatures

  1. started by(range, point)

  2. started by(range1, range2)

Evaluates to true if and only if

  1. range.start = point and range.start included

  2. range1.start = range2.start and range1.start included = range2.start included and (range2.end < range1.end or (range2.end = range1.end and (not(range2.end included) or range1.end included)))

Examples
started by( [1..10], 1 ) = true
started by( (1..10], 1 ) = false
started by( [1..10], 2 ) = false
started by( [1..10], [1..5] ) = true
started by( (1..10], (1..5] ) = true
started by( [1..10], (1..5] ) = false
started by( (1..10], [1..5] ) = false
started by( [1..10], [1..10] ) = true
started by( [1..10], [1..10) ) = true
started by( (1..10), (1..10) ) = true

coincides()

A coincides B

Signatures

  1. coincides(point1, point2)

  2. coincides(range1, range2)

Evaluates to true if and only if

  1. point1 = point2

  2. range1.start = range2.start and range1.start included = range2.start included and range1.end = range2.end and range1.end included = range2.end included

Examples
coincides( 5, 5 ) = true
coincides( 3, 4 ) = false
coincides( [1..5], [1..5] ) = true
coincides( (1..5), [1..5] ) = false
coincides( [1..5], [2..6] ) = false

Temporal functions

Functions for general temporal operations.

day of year( date )

Returns the Gregorian number of the day of the year

Parameters

  • date of type date or date and time

Examples
day of year( date(2019, 9, 17) ) = 260

day of year( date )

Returns the Gregorian day of the week, either of “Monday”, “Tuesday”, “Wednesday”, “Thursday”, “Friday”, “Saturday”, “Sunday”

Parameters

  • date of type date or date and time

Examples
day of week( date(2019, 9, 17) ) = "Tuesday"

month of year( date )

Returns the Gregorian month, either of “January”, “February”, “March”, “April”, “May”, “June”, “July”, “August”, “September”, “October”, “November”, “December”

Parameters

  • date of type date or date and time

Examples
month of year( date(2019, 9, 17) ) = "September"

month of year( date )

Returns the Gregorian week of the year accordingly to ISO 8601

Parameters

  • date of type date or date and time

Examples
week of year( date(2019, 9, 17) ) = 38
week of year( date(2003, 12, 29) ) = 1
week of year( date(2004, 1, 4) ) = 1
week of year( date(2005, 1, 1) ) = 53
week of year( date(2005, 1, 3) ) = 1
week of year( date(2005, 1, 9) ) = 1

Sort function

Function for sorting operations.

sort(list, precedes)

Returns a list of the same elements but ordered accordingly to the sorting function

Parameters

  • list of type list

  • precedes of type function

Examples
sort(list: [3,1,4,5,2], precedes: function(x,y) x < y) = [1,2,3,4,5]

Context functions

Function for context operations.

get value(m, key)

Returns the value from the context, for the specified entry key

Parameters

  • m of type context

  • key of type string

Examples
get value({key1 : "value1"}, "key1") = "value1"
get value({key1 : "value1"}, "unexistent-key") = null

get entries(m)

Computes a list of key and value pair for the given context

Parameters

  • m of type context

Examples
get entries({key1 : "value1", key2 : "value2"}) = [ { key : "key1", value : "value1" }, {key : "key2", value : "value2"} ]