# Set module¶

The Set modules defines functions helper for sets.

## variables:¶

### cardinal : set (‘v) -> int¶

cardinal aset : return the number of elements in the set.

#### Exemple:¶

```% let \$mySet = -< "Tintin" , "Haddock" >-
% \$Set.cardinal \$mySet
2
```

### is_in: set (‘v) -> ‘v -> bool¶

is_in set value: return True if the value given as second argument exist in the set given as first argument. Else return False.

#### Exemple:¶

```% let \$mySet = -< "Tintin" , "Haddock" >-
% \$Set.is_in \$myMap "Castafiore"
False
% \$Set.is_in \$myMap "Haddock"
True
```

### union: set (‘v) -> set (‘v) -> set (‘v)¶

union s1 s2 do the union of set s1 and s2.

#### Exemple:¶

```% let \$mySet = -< 1, 2, 3 >-

% \$Set.union \$mySet -< 3, 4, 5 >-
-< 1 , 2  , 3  , 4  , 5 >-
```

### add: set (‘v) -> ‘v -> set (‘v)¶

add s v: add the value v to set s.

#### Exemple:¶

```% let \$mySet = \$Set.add -< 1, 2, 3 >- 4
-< 1 , 2  , 3  , 4  >-
```

### rm: set (‘v) -> ‘v -> set (‘v)¶

rm s v: If v is a value of s, return the set s without v, else return s.

#### Exemple:¶

```% let \$mySet = \$Set.rm -< 1, 2, 3 >- 2
-< 1 , 3   >-
```