• ← Position
• → PrependTo

Prepend

WMA link

Prepend[expr, item]

returns expr with item prepended to its elements.

Prepend[expr]

Prepend[elem][expr] is equivalent to Prepend[expr,elem].

Prepend is similar to Append, but adds item to the beginning
of expr:

• • Prepend[{2, 3, 4}, 1]

Prepend works on expressions with heads other than List:

• • Prepend[f[b, c], a]

Unlike Join, Prepend does not flatten lists in item:

• • Prepend[{c, d}, {a, b}]