Hold

• Hold has attribute HoldAll, and performs no operation on its arguments.

• Example: Hold[1+1].

• Hold is removed by ReleaseHold.

• Hold[, , ... ] maintains a sequence of unevaluated expressions to which a function can be applied using Apply.

• Even though expr itself is not evaluated, Hold[expr] may still evaluate if expr is of the form f[args], and upvalues for f have been defined.

• See Section 2.6.5.

• See also: HoldPattern, HoldForm, HoldComplete, Unevaluated, HoldAll, Symbol.

• New in Version 1.