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Add str::starts_with_at() #7533

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Add str::starts_with_at() #7533

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7 changes: 7 additions & 0 deletions src/libstd/str.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1484,6 +1484,13 @@ impl<'self> StrSlice<'self> for &'self str {
else if needle_len > self_len { false }
else { match_at(*self, needle, 0u) }
}
/// Returns true if `needle` is a prefix of the string, starting at `begin`.
fn starts_with_at<'a>(&self, needle: &'a str, begin: uint) -> bool {
let (self_len, needle_len) = (self.len(), needle.len());
if needle_len == 0u { true }
else if begin + needle_len > self_len { false }
else { match_at(*self, needle, begin) }
}
/// Returns true if `needle` is a suffix of the string.
fn ends_with(&self, needle: &str) -> bool {
let (self_len, needle_len) = (self.len(), needle.len());
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