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# Sets
Sets represent an unordered collection of unique elements. These are
implemented using hash tables.
```tomo
a := {10, 20, 30}
b := {20, 30}
>> a:overlap(b)
= {20}
```
Here’s the Markdown documentation for set functions:
---
## Set Functions
### `has`
**Description:**
Checks if the set contains a specified item.
**Usage:**
```tomo
has(set:{T}, item:T) -> Bool
```
**Parameters:**
- `set`: The set to check.
- `item`: The item to check for presence.
**Returns:**
`yes` if the item is present, `no` otherwise.
**Example:**
```tomo
>> {10, 20}:has(20)
= yes
```
---
### `add`
**Description:**
Adds an item to the set.
**Usage:**
```tomo
add(set:{T}, item: T) -> Void
```
**Parameters:**
- `set`: The mutable reference to the set.
- `item`: The item to add to the set.
**Returns:**
Nothing.
**Example:**
```tomo
>> nums:add(42)
```
---
### `add_all`
**Description:**
Adds multiple items to the set.
**Usage:**
```tomo
add_all(set:&{T}, items: [T]) -> Void
```
**Parameters:**
- `set`: The mutable reference to the set.
- `items`: The array of items to add to the set.
**Returns:**
Nothing.
**Example:**
```tomo
>> nums:add_all([1, 2, 3])
```
---
### `remove`
**Description:**
Removes an item from the set.
**Usage:**
```tomo
remove(set:&{T}, item: T) -> Void
```
**Parameters:**
- `set`: The mutable reference to the set.
- `item`: The item to remove from the set.
**Returns:**
Nothing.
**Example:**
```tomo
>> nums:remove(42)
```
---
### `remove_all`
**Description:**
Removes multiple items from the set.
**Usage:**
```tomo
remove_all(set:&{T}, items: [T]) -> Void
```
**Parameters:**
- `set`: The mutable reference to the set.
- `items`: The array of items to remove from the set.
**Returns:**
Nothing.
**Example:**
```tomo
>> nums:remove_all([1, 2, 3])
```
---
### `clear`
**Description:**
Removes all items from the set.
**Usage:**
```tomo
clear(set:&{T}) -> Void
```
**Parameters:**
- `set`: The mutable reference to the set.
**Returns:**
Nothing.
**Example:**
```tomo
>> nums:clear()
```
---
### `with`
**Description:**
Creates a new set that is the union of the original set and another set.
**Usage:**
```tomo
with(set:{T}, other: {T}) -> {T}
```
**Parameters:**
- `set`: The original set.
- `other`: The set to union with.
**Returns:**
A new set containing all items from both sets.
**Example:**
```tomo
>> {1, 2}:with({2, 3})
= {1, 2, 3}
```
---
### `overlap`
**Description:**
Creates a new set with items that are in both the original set and another set.
**Usage:**
```tomo
overlap(set:{T}, other: {T}) -> {T}
```
**Parameters:**
- `set`: The original set.
- `other`: The set to intersect with.
**Returns:**
A new set containing only items present in both sets.
**Example:**
```tomo
>> {1, 2}:overlap({2, 3})
= {2}
```
---
### `without`
**Description:**
Creates a new set with items from the original set but without items from another set.
**Usage:**
```tomo
without(set:{T}, other: {T}) -> {T}
```
**Parameters:**
- `set`: The original set.
- `other`: The set of items to remove from the original set.
**Returns:**
A new set containing items from the original set excluding those in the other set.
**Example:**
```tomo
>> {1, 2}:without({2, 3})
= {1}
```
---
### `is_subset_of`
**Description:**
Checks if the set is a subset of another set.
**Usage:**
```tomo
set:is_subset_of(other: {T}, strict: Bool = no) -> Bool
```
**Parameters:**
- `set`: The set to check.
- `other`: The set to compare against.
- `strict`: If `yes`, checks if the set is a strict subset (does not equal the other set).
**Returns:**
`yes` if the set is a subset of the other set (strictly or not), `no` otherwise.
**Example:**
```tomo
>> {1, 2}:is_subset_of({1, 2, 3})
= yes
```
---
### `is_superset_of`
**Description:**
Checks if the set is a superset of another set.
**Usage:**
```tomo
is_superset_of(set:{T}, other: {T}, strict: Bool = no) -> Bool
```
**Parameters:**
- `set`: The set to check.
- `other`: The set to compare against.
- `strict`: If `yes`, checks if the set is a strict superset (does not equal the other set).
**Returns:**
`yes` if the set is a superset of the other set (strictly or not), `no` otherwise.
**Example:**
```tomo
>> {1, 2, 3}:is_superset_of({1, 2})
= yes
```
|
