Problem Statement
Compare all five scope functions (let, run, with, apply, also) and explain when to use each.
Explanation
Let and also pass the object as it parameter, while run, with, and apply use this for context. Let and run return the lambda result allowing transformations, while apply and also return the original object enabling chaining. With is similar to run but not an extension function.
Use let for null-safe calls with question mark dot and transforming objects, apply for object configuration returning the object, run for complex initialization with result, also for side effects while chaining, and with for calling multiple methods on an object without extension syntax.
Examples: person question mark dot let prints name only if not null, Person dot apply sets properties, text dot also saves it while returning text, run combines initialization and returns result, with reads cleaner for multiple calls on one object.
Choosing the right scope function makes code more readable by clearly expressing intent whether you want the lambda result or original object, and whether the object should be it or this.
Practice Sets
This question appears in the following practice sets:
