gives expr with elem appended.

represents an operator form of Append that can be applied to an expression.


  • In iteratively building a list, it is usually more efficient to use Sow and Reap than to use Append[list,new] at each step.
  • Append works on SparseArray objects, returning ordinary lists if necessary.
  • Append can be used on Association objects. Single new elements are specified in the form . New values replace older ones if their keys are the same.
  • Multiple elements to append to an association can be specified in the form .
  • Append[elem][expr] is equivalent to Append[expr,elem].
Introduced in 1988
| Updated in 2014
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