byte_at

fn byte_at(string s, int i) -> int

use string::{byte_at};

Returns the byte at byte offset i of s, or -1 when i is out of range.

Offsets count UTF-8 bytes, not characters, and s.len() is the byte length. The result is 0..=255 for any offset in 0..s.len().

Parameters#

Returns#

int

Examples#

use string::{byte_at};
use tests::assert;
assert!(byte_at("abc", 0) == 97);
assert!(byte_at("abc", 3) == -1);
assert!(byte_at("abc", -1) == -1);

See also#

• find_from: Returns the byte offset of the first needle in hay at or after start, or -1.
• format: Builds a string from the literal fmt and the arguments that follow it.
• from_bytes: Decodes bytes as UTF-8 text.
• match_at: Returns whether needle occurs in s starting exactly at byte offset at.
• rfind: Returns the byte offset of the last needle in hay, or -1.
• slice_bytes: Returns the part of s between byte offsets start (inclusive) and end (exclusive).
• to_bytes: Encodes s as UTF-8 into a new Vec<byte>.