Queue: R6 Class - A First-In-First-Out Abstract Data Type

In teal.transform: Functions for Extracting and Merging Data in the 'teal' Framework

R6 Class - A First-In-First-Out Abstract Data Type

Description

Abstract data type that stores and returns any number of elements.

Details

A Queue object stores all elements in a single vector, thus all data types can be stored, but silent coercion may occur.

Elements are returned in the same order that they were added.

Methods

Public methods

• Queue$push()

• Queue$get()

• Queue$pop()

• Queue$remove()

• Queue$empty()

• Queue$size()

• Queue$print()

• Queue$clone()

---

Queue$push()

Adds element(s) to Queue.

Usage

Queue$push(new_elements)

Arguments

new_elements

vector of elements to add.

Returns

self, invisibly.

---

Queue$get()

Returns all contents of the Queue object.

Usage

Queue$get()

Returns

Single vector containing all Queue contents.

---

Queue$pop()

Returns the first (oldest) element of the Queue and removes it.

Usage

Queue$pop()

Returns

vector of length 1 containing the first element of Queue or NULL if Queue is empty.

---

Queue$remove()

Removes the oldest occurrence of specified element(s) from Queue. Relies on implicit type conversions of R identify elements to remove.

Usage

Queue$remove(elements)

Arguments

elements

vector of elements to remove from Queue.

Returns

self, invisibly.

---

Queue$empty()

Removes all elements from Queue.

Usage

Queue$empty()

Returns

self, invisibly.

---

Queue$size()

Returns the number of elements in Queue.

Usage

Queue$size()

Returns

integer(1).

---

Queue$print()

Prints this Queue.

Usage

Queue$print(...)

Arguments

...

Additional arguments to this method, ignored.

Returns

self, invisibly.

---

Queue$clone()

The objects of this class are cloneable with this method.

Usage

Queue$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

teal.transform documentation built on June 29, 2026, 9:08 a.m.