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Mutate ?? and ?. in TypeScript and JavaScript, including Express handlers.

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Robert C. Martin
2026-10-03 08:49:10 -05:00
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@@ -95,7 +95,7 @@ Tokens inside strings, comments, and quoted Clojure forms are left alone. A repl
| Clojure | clj-mutate's head symbols: `+`/`-`, `*` to `/`, `inc`/`dec`, comparisons, `=`/`not=`, `if`/`if-not`, `when`/`when-not`, `and`/`or`, and the seq, predicate, and coercion pairs. `true`/`false` and `0`/`1` anywhere. |
| Java | `true`/`false`, `==`/`!=`, `<`/`<=`, `>`/`>=`, `+`/`-`, `*`/`/`, `&&`/`||`, delete `!` and unary `-`, `0`/`1`. Constructors are not entries, matching crapper. |
| Go | mutate4go: `+`/`-`, `*` to `/` only, comparisons, `==`/`!=`, `true`/`false`, `&&`/`||`, `0`/`1`. |
| TypeScript | the Java set, plus `===`/`!==`. |
| TypeScript | the Java set, plus `===`/`!==`, `??` to `||`, and `?.` to `.`. A call or index drops `?.` (`a?.()` becomes `a()`). `.js`, `.jsx`, `.mjs`, and `.cjs` use these rules. |
| Rust | the Java set (`&&`/`||`, `!`, unary `-`). |
| Python | the Java set, spelled `and`/`or`, `not`, and `True`/`False`. |