prepend

For filters.

Prepend any number of rows to a table.

Command Type

built-in

Signature

> prepend {flags} (row)

Parameters

row: The row, list, or table to prepend.

Input/output types:

input	output
any	list<any>

Examples

Prepend a list to an item.

> 0 | prepend [1 2 3]
╭───┬───╮
│ 0 │ 1 │
│ 1 │ 2 │
│ 2 │ 3 │
│ 3 │ 0 │
╰───┴───╯

Prepend a list of strings to a string.

> "a" | prepend ["b"]
╭───┬───╮
│ 0 │ b │
│ 1 │ a │
╰───┴───╯

Prepend one int item.

> [1 2 3 4] | prepend 0
╭───┬───╮
│ 0 │ 0 │
│ 1 │ 1 │
│ 2 │ 2 │
│ 3 │ 3 │
│ 4 │ 4 │
╰───┴───╯

Prepend two int items.

> [2 3 4] | prepend [0 1]
╭───┬───╮
│ 0 │ 0 │
│ 1 │ 1 │
│ 2 │ 2 │
│ 3 │ 3 │
│ 4 │ 4 │
╰───┴───╯

Prepend ints and strings.

> [2 nu 4 shell] | prepend [0 1 rocks]
╭───┬───────╮
│ 0 │     0 │
│ 1 │     1 │
│ 2 │ rocks │
│ 3 │     2 │
│ 4 │ nu    │
│ 5 │     4 │
│ 6 │ shell │
╰───┴───────╯

Prepend a range.

> [3 4] | prepend 0..2
╭───┬───╮
│ 0 │ 0 │
│ 1 │ 1 │
│ 2 │ 2 │
│ 3 │ 3 │
│ 4 │ 4 │
╰───┴───╯

Notes

Be aware that this command ‘unwraps’ lists passed to it. So, if you pass a variable to it, and you want the variable’s contents to be prepended without being unwrapped, it’s wise to pre-emptively wrap the variable in a list, like so: prepend [$val]. This way, prepend will only unwrap the outer list, and leave the variable’s contents untouched.

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