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Kotlin
Cheatsheet: let / apply / also / run / with
Five scope functions cover ~95% of "do something with x" patterns. Pick by two axes: receiver (this vs it) and return value (object itself vs block result).
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Kotlin
also — Side Effect, Return Itself
`x.also { ... }` runs a side-effect block with `x` as `it` and returns `x` unchanged. Used for logging, debugging, or asserting mid-chain without breaking it.
Kotlin
with — Scope an Existing Object
`with(x) { ... }` is `run` flipped: the receiver is the first argument. Reads naturally when you're doing several things to an existing object without chaining.
Kotlin
run — Compute With Scope
`x.run { ... }` is `apply` but returns the block's LAST expression instead of `x`. Top-level `run { ... }` (no receiver) is useful for inline computation blocks.
Kotlin
let — Transform or Null-Safe Scope
`x.let { it.foo }` runs the block with `x` as `it` and returns the block's last expression. Combined with `?.`, it's the canonical "do this only if non-null" pattern.