36 lines
849 B
Nix
36 lines
849 B
Nix
with {
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inherit (import ./lists.nix) deepSeqList;
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inherit (import ./attrsets.nix) deepSeqAttrs;
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};
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rec {
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# Identity function.
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id = x: x;
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# Constant function.
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const = x: y: x;
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# Named versions corresponding to some builtin operators.
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concat = x: y: x ++ y;
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or = x: y: x || y;
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and = x: y: x && y;
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mergeAttrs = x: y: x // y;
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# Take a function and evaluate it with its own returned value.
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fix = f: let result = f result; in result;
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# Flip the order of the arguments of a binary function.
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flip = f: a: b: f b a;
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# `seq x y' evaluates x, then returns y. That is, it forces strict
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# evaluation of its first argument.
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seq = x: y: if x == null then y else y;
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deepSeq = x: y:
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if builtins.isList x
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then deepSeqList x y
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else if builtins.isAttrs x
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then deepSeqAttrs x y
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else seq x y;
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}
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