Js Cache Property Access

## Cache Property Access in Loops Cache object property lookups in hot paths. **Incorrect (3 lookups × N iterations):** ```typescript for (let i = 0; i < arr.length; i++) { process(obj.config.settings.value) } ``` **Correct (1 lookup total):** ```typescript const value = obj.config.settings.value const len = arr.length for (let i = 0; i < len; i++) { process(value) } ```