map

fn map<T, U>(Vec<T> xs, T -> U mapper) -> Vec<U>

use collections::vec::{map};

Returns a new vector with mapper applied to each element, in order.

Parameters#

Returns#

Vec<U>

Examples#

use collections::vec::{map};
use string::{format};
use tests::assert;
let xs: Vec<int> = [1, 2, 3];
let squares = map(xs, fn (int x) => x * x);
assert!(squares[2] == 9);
let labels = map(xs, fn (int x) => format("#%i", x));
assert!(labels[0] == "#1");

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.
• filter: Returns the elements for which pred is true, in order.
• first: Returns the first element, or None when xs is empty.
• last: Returns the last element, or None when xs is empty.