Once

可用

Evaluates an expression once and returns the cached result

形式

Once[expr]

Once[expr, loc]

验证过的示例Once[result = CloudGet["https://www.wolframcloud.com/objects/ecdc9d78-f517-4682-93d8-790a3de79ee0"]] → CloudGet[https://www.wolframcloud.com/objects/ecdc9d78-f517-4682-93d8-790a3de79ee0]Once[Print["pang"];2] → 2 Once[Print["pong"];1 + 1] → 2选项

ExpirationDate — default None
PersistenceTime — default None

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主题

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