"Stack" (Data Structure)


represents a stack of expressions.


  • A stack is a collection of elements that supports last-in, first-out insertion and removal:
  • CreateDataStructure["Stack"]create a new empty "Stack"
    Typed[x,"Stack"]give x the type "Stack"
  • For a data structure of type "Stack", the following operations can be used:
  • ds["Copy"]return a copy of dstime: O(n)
    ds["DropAll"]drop all the elements from dstime: O(n)
    ds["Elements"]return a list of the elements of dstime: O(n)
    ds["EmptyQ"]True, if the ds is emptytime: O(1)
    ds["Length"]number of elements in dstime: O(1)
    ds["Peek"]last element in dstime: O(1)
    ds["Pop"]remove the last element in ds and return ittime: O(1)
    ds["Push",x]add x to the end of dstime: O(1)
    ds["Visualization"]return a visualization of dstime: O(n)
  • The following functions are also supported:
  • dsi===dsjTrue, if dsi equals dsj
    FullForm[ds]full form of ds
    Information[ds]information about ds
    InputForm[ds]input form of ds
    Normal[ds]convert ds to a normal expression


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Basic Examples  (2)

A new "Stack" can be created with CreateDataStructure:

ds is initially empty:

Add an element to ds:

ds is no longer empty:

It has one element:

Add another element and peek. This shows the last element:

Remove the last element and return it:

Return an expression version of ds:

It is fast to push elements onto a stack:

A visualization of the data structure can be generated:

Scope  (1)

Information  (1)

A new "Stack" can be created with CreateDataStructure:

Information about the data structure ds: