Prepend

Prepend(expr, item)

returns expr with item prepended to its leaves.

Examples

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

>> Prepend({2, 3, 4}, 1)
{1,2,3,4}

Prepend works on expressions with heads other than ‘List’:

>> Prepend(f(b, c), a)
f(a,b,c)

Unlike Join, Prepend does not flatten lists in item:

>> Prepend({c, d}, {a, b})
{{a,b},c,d}

Nonatomic expression expected.

>> Prepend(a, b)
Prepend(a,b)

Implementation status

• ✅ - full supported

Github

• Implementation of Prepend