List Concatenation

rascal-0.40.17

Synopsis

Concatenate two lists.

Syntax

Exp₁ + Exp₂

Types

//

Exp₁	Exp₂	Exp₁ + Exp₂
list[T₁]	list[T₂]	list[lub(T₁,T₂)]

Description

The + operator concatenates the elements of the two lists in order of appearance.

Note that the same operator is overloaded for Insert and Append.

Examples

rascal>[1, 2, 3] + [4, 5, 6];
list[int]: [1,2,3,4,5,6]
rascal>[] + [1]
list[int]: [1]
rascal>[1] + []
list[int]: [1]
rascal>[1] + [2] + [3]
list[int]: [1,2,3]

And overloaded usage for insert and append looks like:

rascal>1 + []
list[int]: [1]
rascal>[] + 1
list[int]: [1]