mirror of
https://github.com/nushell/nushell
synced 2025-01-02 16:29:00 +00:00
19d5f782cc
`drop` is used for removing the last row. Passing a number allows dropping N rows. Here we introduce the same logic for dropping columns instead. You can certainly remove columns by using `reject`, however, there could be cases where we are interested in removing columns from tables that contain, say, a big number of columns. Using `reject` becomes impractical, especially when you don't care about the column names that could either be known or not known when exploring tables. ``` > echo [[lib, extension]; [nu-core, rs] [rake, rb]] ─────────┬─────────── lib │ extension ─────────┼─────────── nu-core │ rs rake │ rb ─────────┴─────────── ``` ``` > echo [[lib, extension]; [nu-core, rs] [rake, rb]] | drop column ───────── lib ───────── nu-core rake ───────── ```
68 lines
1.2 KiB
Rust
68 lines
1.2 KiB
Rust
use nu_test_support::{nu, pipeline};
|
|
|
|
#[test]
|
|
fn columns() {
|
|
let actual = nu!(
|
|
cwd: ".", pipeline(r#"
|
|
echo [
|
|
[arepas, color];
|
|
|
|
[3, white]
|
|
[8, yellow]
|
|
[4, white]
|
|
]
|
|
| drop column
|
|
| get
|
|
| count
|
|
"#)
|
|
);
|
|
|
|
assert_eq!(actual.out, "1");
|
|
}
|
|
|
|
#[test]
|
|
fn more_columns_than_table_has() {
|
|
let actual = nu!(
|
|
cwd: ".", pipeline(r#"
|
|
echo [
|
|
[arepas, color];
|
|
|
|
[3, white]
|
|
[8, yellow]
|
|
[4, white]
|
|
]
|
|
| drop column 3
|
|
| get
|
|
| empty?
|
|
"#)
|
|
);
|
|
|
|
assert_eq!(actual.out, "true");
|
|
}
|
|
|
|
#[test]
|
|
fn rows() {
|
|
let actual = nu!(
|
|
cwd: ".", pipeline(r#"
|
|
echo [
|
|
[arepas];
|
|
|
|
[3]
|
|
[8]
|
|
[4]
|
|
]
|
|
| drop 2
|
|
| get arepas
|
|
| math sum
|
|
"#)
|
|
);
|
|
|
|
assert_eq!(actual.out, "3");
|
|
}
|
|
|
|
#[test]
|
|
fn more_rows_than_table_has() {
|
|
let actual = nu!(cwd: ".", "date | drop 50 | count");
|
|
|
|
assert_eq!(actual.out, "0");
|
|
}
|