Append
Append[expr,elem]
gives expr with elem appended.
Details

- 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 key->value. New values replace older ones if their keys are the same.
- Multiple elements to append to an association can be specified in the form {key1->value1,key2->value2, …}.
- Append[elem][expr] is equivalent to Append[expr,elem].
Examples
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