filter

fn filter<T>(Vec<T> xs, T -> bool pred) -> Vec<T>

use collections::vec::{filter};

Returns the elements for which pred is true, in order.

Parameters#

Returns#

Vec<T>

Examples#

use collections::vec::{filter};
use tests::assert;
let xs: Vec<int> = [1, 2, 3, 4];
let even = filter(xs, fn (int x) => x % 2 == 0);
assert!(even.len() == 2 && even[0] == 2);

See also#

• fold_int: The same as fold; kept for older code.
• contains: Returns true when needle is in xs.
• index_of: Returns the index of the first needle in xs, or -1.
• binary_search: Finds needle in the ascending vector xs by halving, and returns an index holding it.
• dedup: Returns xs with runs of equal neighbours collapsed to one value.
• map: Returns a new vector with mapper applied to each element, in order.
• first: Returns the first element, or None when xs is empty.
• last: Returns the last element, or None when xs is empty.