Rascal/Expressions/Values/Set/Comprehension

Name Rascal/Expressions/Values/Set/Comprehension

Synopsis A set comprehension generates a set value.

Syntax { Exp₁, Exp₂, ... | Gen₁, Gen₂, ... }

Types

`Exp₁`	`Exp₂`	...	`{ Exp₁, Exp₂, ... \| Gen₁, Gen₂, ... }`
`T₁`	`T₂`	...	`set[ lub( T₁, T₂, ... ) ]`

Description A set comprehension consists of a number of contributing expressions Exp₁, Exp₂, ... and a number of generators Gen₁, Gen₂, Gen₃, ... that are evaluated as described in Expressions/Comprehensions.

Examples

rascal>{ N * N | int N <- [0 .. 10]};
set[int]: {1,9,16,25,0,64,4,36,49,81}
rascal>{ N * N | int N <- [0 .. 10], N % 3 == 0};
set[int]: {0,36,9,81}

Questions

Question [1].

Question [2].

{ N + 1 | int N <- [4 .. 10] } ==

Question [3].

{ 2 * N | int N <- {19} } ==

Question [4].

Complete this comprehension:

{  | int N <- {-7, 12, -18, -2} } == {11,-19,-8,-3}

[Edit] | [New Subconcept] | [Recompile Course] | [Warnings]

Is this page unclear, or have you spotted an error? Please add a comment below and help us to improve it. For all other questions and remarks, visit ask.rascal-mpl.org.