push()

Appends a value to a stack variable. The stack is created if not found.

If the distinct qualifier is used, the value to be pushed is ignored if it is already present in the stack. Adding the notnone qualifier prevents push() from adding a None to the stack.

Data signatures
push( new stack name: $${\color{green}str}$$ )
push( stack name: $${\color{green}str}$$ ǁ list, push this: $${\color{green}None}$$ ǁ $${\color{green}Any}$$ )

Call signatures
push( new stack name: Term )
push( stack name: Term ǁ Variable ǁ Header ǁ Function ǁ Reference, push this: Term ǁ Variable ǁ Header ǁ Function ǁ Reference )

Purpose	Value
Main focus	push() is a side-effect

Context	Qualifier
Match qualifiers	onmatch, distinct, notnone, skipnone
Value qualifiers	onmatch

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