Rule

可用，但與 .wl 參考有差異

`Rule[a, b]` creates an immediate replacement rule (`a -> b`).

形式

lhs -> rhs or lhs -> rhs

已驗證的範例Rule[a, b] → a -> b RuleDelayed[x, Random[]] → x :> Random[]ToString[f[a -> 5 // Head], InputForm] → f[Rule]ToString[{a -> 5 /. 5 -> 6}, InputForm] → {a -> 6}ToString[(1 -> 2) /. Rule -> List, InputForm] → {1, 2}ToString[{a -> 1} /. Rule -> ff, InputForm] → {ff[a, 1]}

在 Qurak 上執行搜尋參考文件

使用於

Replace or remove invalid or missing data - 23 個步驟

主題

Expressions - Common General-Purpose Expression Types
Language Overview - Rules & Transformations »
Options Management - Setting Up Options for Functions
Programmable Linguistic Interface - Grammar Actions
Rules - Representing Rules
Rules And Patterns - Rules »

相關

RuleDelayed TwoWayRule DirectedEdge Replace ReplaceAll Set Keys Values Association Lookup KeyValuePattern ArgumentsOptions

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