substring
builtins.substring
Primop
Docs pulled from | This Revision | about 13 hours ago
Takes 3 arguments
start, len, s
Return the substring of s from byte position start
(zero-based) up to but not including start + len. If start is
greater than the length of the string, an empty string is returned.
If start + len lies beyond the end of the string or len is -1,
only the substring up to the end of the string is returned.
start must be non-negative.
For example,
builtins.substring 0 3 "nixos"
evaluates to "nix".
This function is not defined in a .nix file. It is likely a builtins function or an alias of a builtins function. builtins functions are predefined functions provided by Nix.
Noogle detected
Detected Type
substring :: Int -> Int -> String -> String
Implementation
This function is implemented in c++ and is part of the native nix runtime.