Assign to l a list:

Include a new value at the end of the list:

The value assigned to l has changed:

Use an arbitrary head:

Append to an Association:

Assigns to s a sparse matrix:

Add a row to the matrix:

Appending an element with inconsistent dimensions requires converting to ordinary lists:

The first argument to AppendTo need not be a symbol:

Append to a shared list in parallel:

Assign m to be a 2×2 matrix:

Append a row to m:

Append a column to m:

m is now a 3×3 matrix:

The first argument must have a value:

The first argument must be assigned to something which can be appended to:

Something for which AtomQ is True cannot generally be appended to:

Using AppendTo on a column of a matrix replaces column values:

Append to a matrix column:

Reset the column values with the new value:

Using AppendTo to accumulate values in large loops can be slow:

There are many alternatives, such as using Reap and Sow:

When working on a shared list in parallel, AppendTo is atomic:

The seemingly equivalent expression using Append is not atomic: