A function which returns its value unmodified.
x(Any): The value to return.
(Any): The value given as the parameter.
var identity = identity;// Returns its valuevar x = ;console;// => 42
A function which does nothing
var noop = noop;// This does nothing!;
Throws the specified error
err(Any): The error to throw
var throwError = throwError;// Returns its value// => Error: woops
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