hasSuffix
lib.hasSuffix
Docs pulled from | This Revision | about 1 hour ago
Determine whether a string has given suffix.
Inputs
suffix- Suffix to check for
content- Input string
Type
hasSuffix :: string -> string -> bool
Examples
lib.strings.hasSuffix usage example
hasSuffix "foo" "foobar"
=> false
hasSuffix "foo" "barfoo"
=> true
Noogle detected
Implementation
The following is the current implementation of this function.
hasSuffix =
suffix:
content:
let
lenContent = stringLength content;
lenSuffix = stringLength suffix;
in
# Before 23.05, paths would be copied to the store before converting them
# to strings and comparing. This was surprising and confusing.
warnIf
(isPath suffix)
''
lib.strings.hasSuffix: The first argument (${toString suffix}) is a path value, but only strings are supported.
There is almost certainly a bug in the calling code, since this function always returns `false` in such a case.
This function also copies the path to the Nix store, which may not be what you want.
This behavior is deprecated and will throw an error in the future.''
(
lenContent >= lenSuffix
&& substring (lenContent - lenSuffix) lenContent content == suffix
);