Class Set<T>

GoJS® Diagramming Components
version 3.0.16
by Northwoods Software®

An unordered iterable collection that cannot contain two instances of the same value. In TypeScript it is a generic class that enforces at compile-time the type of elements that may be added to the Set.

An example usage:

  const set = new go.Set();  // In TypeScript: new go.Set<string>();
  set.add("orange");
  set.add("apple");
  set.add("orange");
  // now set.size === 2
  // and set.has("orange") === true
  // and set.has("banana") === false

You can iterate over the items in a Set:

  const it = aSet.iterator;
  while (it.next()) {
    . . . it.value . . .
  }

Or:

  aSet.each(val => {
      . . . val . . .
    });

For compatibility with versions of GoJS before version 3.0, the following synonyms are defined:

remove(val): delete
contains(val): has
count: size

The constructor now takes an optional Iterable or Array argument that provides the initial elements for the new Set.

Note that GoJS iteration is quite different than ECMAScript iteration, so that functionality has not been made somewhat compatible. These collection classes were defined in GoJS before the ECMAScript collection classes were proposed.

Type Parameters

Implements

Iterable<T>

Index

Constructors

constructor

new Set<T>(coll?: Iterable<T> | T[]): Set<T>
There are two possible constructors:

new go.Set(), for JavaScript

new go.Set<T>() for TypeScript

In TypeScript, the optional generic argument describes the type of values that this Set may hold.

For example, the expression:
```
// TypeScript:
new go.Set<go.Point>()
```
Creates a new Set that may only contain Points.
Type Parameters
- T
Parameters
- Optional coll: Iterable<T> | T[]
  an optional collection of items to add.
Returns Set<T>

Accessors

`Readonly`count
: number

This read-only property is the number of elements in the Set.

`Readonly`iterator
: Iterator<T>

Gets an object that you can use for iterating over the Set. The value will be a member of the Set. Typical usage:
```
  const it = aSet.iterator;
  while (it.next()) {
    . . . " value: " + it.value . . .
  }
```

`Readonly`size
: number

This read-only property is the number of elements in the Set.

Methods

[iterator]

[iterator](): IterableIterator<T>
This class implements the JavaScript Symbol.iterator, and can be used with spread syntax or for ... of statements.

Returns IterableIterator<T>
since
3.0

add

add(val: T): Set<T>
Adds a given value to the Set, if not already present.

Be careful not to call this method while iterating over the collection.
Parameters
- val: T
  The value to add to the Set; must not be null.
Returns Set<T>
This modified Set.

addAll

addAll(coll: Iterable<T> | T[]): Set<T>
Adds all of the values of a collection to this Set.

Be careful not to call this method while iterating over the collection.
Parameters
- coll: Iterable<T> | T[]
  the collection of items to add.
Returns Set<T>
This modified Set.

`Virtual`all

all(pred: ((a: T) => boolean)): boolean
This is true if all invocations of the given predicate on items in the collection are true.

Call the given predicate on each item in the collection. As soon as a call returns false, this returns false. Otherwise this returns true. For an empty collection this returns true.
Parameters
- pred: ((a: T) => boolean)
  This function must not have any side-effects.
  - - (a: T): boolean
    - Parameters
      a: T
      Returns boolean
Returns boolean
True if all predicate calls are true; false otherwise.

`Virtual`any

any(pred: ((a: T) => boolean)): boolean
This is true if any invocation of the given predicate on items in the collection is true.

Call the given predicate on each item in the collection. As soon as a call returns true, this returns true. Otherwise this returns false. For an empty collection this returns false.
Parameters
- pred: ((a: T) => boolean)
  This function must not have any side-effects.
  - - (a: T): boolean
    - Parameters
      a: T
      Returns boolean
Returns boolean
True if any predicate call is true; false otherwise.

clear

clear(): void
Clears the Set. This sets the count to zero.

Be careful not to call this method while iterating over the collection.

Returns void

contains

contains(val: T): boolean
Returns whether the given value is in this Set.
Parameters
- val: T
  The value to check.
Returns boolean
Whether or not the value is contained within the Set.

containsAll

containsAll(coll: Iterable<T>): boolean
Returns true if all of the values of a given collection are in this Set.
Parameters
- coll: Iterable<T>
  the collection of items to check for.
Returns boolean

containsAny

containsAny(coll: Iterable<T>): boolean
Returns true if any of the values of a given collection are in this Set.
Parameters
- coll: Iterable<T>
  the collection of items to check for.
Returns boolean

`Virtual`copy

copy(): Set<T>
Makes a shallow copy of this Set. The values are not copied, so if they are objects they may continue to be shared with the original Set.

Returns Set<T>
The new Set with the same elements.

delete

delete(val: T): boolean
Removes a value (if found) from the Set.

Be careful not to call this method while iterating over the collection.
Parameters
- val: T
  The value to remove.
Returns boolean
true if the value was found and removed, false otherwise.

`Virtual`each

each(func: ((a: T) => void)): Set<T>
Call the given function on each item in the collection.
Parameters
- func: ((a: T) => void)
  This function must not modify the collection.
  - - (a: T): void
    - Parameters
      a: T
      Returns void
Returns Set<T>
This Set itself.

first

first(): T
Returns the first item in the collection, or null if there is none.

Returns T
This returns null if there are no items in the collection.

forEach

forEach(callbackFunc: ((value1: T, value2: T, map: Set<T>) => void), thisArg: any): void
Call a provided function once per each key/value pair in this Set.
Parameters
- callbackFunc: ((value1: T, value2: T, map: Set<T>) => void)
  a function to call for each value in the Set
  - - (value1: T, value2: T, map: Set<T>): void
    - Parameters
      value1: T
      value2: T
      map: Set<T>
      Returns void
- thisArg: any
  a value to use as this when executing callbackFunc
Returns void
since
3.0

has

has(val: T): boolean
Returns whether the given value is in this Set.
Parameters
- val: T
  The value to check.
Returns boolean
Whether or not the value is contained within the Set.

remove

remove(val: T): boolean
Removes a value (if found) from the Set.

Be careful not to call this method while iterating over the collection.
Parameters
- val: T
  The value to insert.
Returns boolean
true if the value was found and removed, false otherwise.

removeAll

removeAll(coll: Iterable<T> | T[]): Set<T>
Removes all of the values of a collection from this Set.

Be careful not to call this method while iterating over the collection.
Parameters
- coll: Iterable<T> | T[]
  the collection of items to remove.
Returns Set<T>
This modified Set.

retainAll

retainAll(coll: Iterable<T>): Set<T>
Removes from this Set all items that are not in the given collection.

Be careful not to call this method while iterating over the collection.
Parameters
- coll: Iterable<T>
  the collection of items that should be kept in this Set.
Returns Set<T>
This modified Set.

toArray

toArray(): T[]
Produces a JavaScript Array from the contents of this Set.

Returns T[]
A copy of the Set in Array form.

toList

toList(): List<T>
Converts the Set to a List. Because there is no ordering within a Set, the values in the List may be in any order.

Returns List<T>
A copy of the contents of this Set in List form.

values

values(): IterableIterator<T>
Return a JavaScript iterator that produces the values in this Set. This does not produce the old GoJS style Iterator -- use the iterator property if you want that.

Returns IterableIterator<T>
since
3.0

Class Set<T>

Type Parameters

Implements

Index

Constructors

Accessors

Methods

Constructors

constructor

Type Parameters

Parameters

Optional coll: Iterable<T> | T[]

Returns Set<T>

Accessors

Readonlycount: number

Readonlyiterator: Iterator<T>

Readonlysize: number

Methods

[iterator]

Returns IterableIterator<T>

add

Parameters

val: T

Returns Set<T>

addAll

Parameters

coll: Iterable<T> | T[]

Returns Set<T>

Virtualall

Parameters

pred: ((a: T) => boolean)

Parameters

a: T

Returns boolean

Returns boolean

Virtualany

Parameters

pred: ((a: T) => boolean)

Parameters

a: T

Returns boolean

Returns boolean

clear

Returns void

contains

Parameters

val: T

Returns boolean

containsAll

Parameters

coll: Iterable<T>

Returns boolean

containsAny

Parameters

coll: Iterable<T>

Returns boolean

Virtualcopy

Returns Set<T>

delete

Parameters

val: T

Returns boolean

Virtualeach

Parameters

func: ((a: T) => void)

Parameters

a: T

Returns void

Returns Set<T>

first

Returns T

forEach

Parameters

callbackFunc: ((value1: T, value2: T, map: Set<T>) => void)

Parameters

value1: T

value2: T

map: Set<T>

Returns void

thisArg: any

`Optional` coll: Iterable<T> | T[]

`Readonly`count
: number

`Readonly`iterator
: Iterator<T>

`Readonly`size
: number

`Virtual`all

`Virtual`any

`Virtual`copy

`Virtual`each