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1.4 KiB
1.4 KiB
string literals
Instructions
Create the following functions:
is_empty
: that returnstrue
if the string is empty.is_ascii
: that returnstrue
if all characters are within the ASCII range.contains
: that returnstrue
if the string contains the given pattern.split_at
: that divides a string in two returning a tuple.find
: that returns the index if the first character of a given string that matches the pattern.
pub fn is_empty(v: &str) -> bool {
}
pub fn is_ascii(v: &str) -> bool {
}
pub fn contains(v: &str, pat: &str) -> bool {
}
pub fn split_at(v: &str, index: usize) -> (&str, &str) {
}
pub fn find(v: &str, pat: char) -> usize {
}
Your heap allocations will be monitored to ensure that you do not make too many allocations, and that your allocations are reasonably sized.
Usage
Here is a program to test your function
use string_literals::*;
fn main() {
println!("{}", is_empty(""));
println!("{}", is_ascii("rust"));
println!("{}", contains("rust", "ru"));
println!("{:?}", split_at("rust", 2));
println!("{}", find("rust", 'u'));
}
And its output
$ cargo run
true
true
true
("ru", "st")
1
$