Append an element to a list:

Append a row to a matrix:

Append to an Association:

Define an append operator:

Append the list to a flat list, resulting in a nested list:

Append to a list of lists, producing a matrix:

Format the matrix:

Create a 3×3 sparse array:

Append a row to it, producing another sparse array:

The sparse array will revert to a normal array if the array structure cannot be maintained:

Append to an expression with a general head:

Append several rules to an Association:

Compare with the behavior of prepending to a list of rules:

Append a row to a matrix:

Append to each row in a matrix:

Append a vector to a matrix:

Successively append to a list:

Append[list,x] is equivalent to Join[list,{x}]:

This is true even when x is a list:

For a general expression e, Append[e,x] is equivalent to Join[e,Head[e][x]]:

Append[x][e] is equivalent to Append[e,x]:

When appending to an association, if a key already exists, its value will be overwritten by the appended value:

There is no special behavior when the first and second arguments have the same head:

It is possible to use Flatten after Append to effectively prepend several elements individually:

Alternatively, use Join with the arguments reversed:

When working on a shared list in parallel, Append is not atomic (or thread-safe):

Use AppendTo in such circumstances: