| 摘要 |
A facility for enabling the use of user-defined function in a spreadsheet document made up of cells is described. The facility receives a trigger to evaluate cells that include a distinguished cell. In response to receiving the trigger, the facility determines that the distinguished cell contains an invocation of a user-defined function. In response to determining that the distinguished cell contains an invocation of a user-defined function, the facility applies the user-defined function defined in the second cell to both (a) determine a result value for the invocation of the user-defined function and (b) from the determiner's old value, obtain a value for the distinguished cell.
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