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Frameworks & web · #lodash
The _.cloneDeep function in lodash is designed to recursively clone nested objects, arrays, and ES6 collections like Map and Set while managing circular references to prevent stack overflows. A specific design constraint exists regarding prototype chains. While the function creates new instances of built-in types, it primarily clones enumerable own propertie
When merging configuration objects that contain array-valued properties, developers often rely on lodash’s _.merge to combine defaults with overrides. However, _.merge merges arrays by index rather than concatenating or replacing them, which can silently reshape data—e.g., merging {tags:['a','b']} with {tags:['c']} yields {tags:['c','b']}. This behavior dive
Confirm whether Lodash _.memoize incorporates every function argument into the default cache key, or only the first argument, when caching results in Lodash 4.x. The default resolver appears to stringify only the first argument. If true, calls such as fn(1, 2) and fn(1, 3) could return the same cached value because the trailing argument never participates in
Lodash deep-path utilities such as _.set , _.update and _.merge block path segments named __proto__ as part of the 4.17.x security hardening, so a path like a.__proto__.b should no longer write to Object.prototype through those APIs. The goal is to determine how far this built-in guard can be trusted when property paths or merge sources originate from untrus
Goal: determine whether Lodash _.debounce executes both a maxWait-forced invocation and a pending trailing invocation when they land at the same time, or whether the two coalesce into one call. Assumption: Lodash 4.x. The documentation describes leading, trailing, and maxWait as independent options, but does not specify deterministic behavior when a trailing
When a debounced function returns a promise, .cancel() only clears the internal timer and resets state. It cannot interrupt the asynchronous work that the callback has already started. This means a caller can cancel a pending debounce but the in‑flight promise will still resolve or reject, potentially after the cancellation point. Additionally, the maxWait o
Determine whether Lodash 4.x's _.cloneDeep produces a truly detached copy when the source value includes Proxy‑wrapped objects, functions, DOM nodes, or WeakMap entries. Because the algorithm treats uncloneable values as plain objects and does not invoke Proxy traps, it is unclear whether the resulting clone retains any behavioral link to the original handle
Execution Control in Lodash 4.x The _.debounce function provides a .cancel() method to abort pending executions. When configured with trailing: true , the wrapper maintains a timer to ensure the final call in a sequence is executed after the wait period. Cancellation Constraints There is a design uncertainty regarding the state of the internal timer when .ca
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