Cheat-Sheets

Kotlin

Scope functions

Official doc

Function	Usage	Return	Context object available as
.let { }	perform actions on nullable object or transform an object and chain results	the result of the lambda	it (argument)
.run { }	transform or perform operations on an object and return a specific result	the result of the lambda	this (receiver) or none
.also { }	perform additional actions while returning the object itself	the original object it was called on (“context object”)	it
.apply { }	configure an object by calling its functions or properties (ex building an object in a more readable way)	the original object it was called on (“context object”)	this
.with { }	execute multiple operations on an object without explicit reference	the result of the lambda	this

From the doc: ref

• Executing a lambda on non-nullable objects: let
• Introducing an expression as a variable in local scope: let
• Object configuration: apply
• Object configuration and computing the result: run
• Running statements where an expression is required: non-extension run
• Additional effects: also
• Grouping function calls on an object: with

Renaming the “it” argument:

object.also { myCustomNameForIt -> …. }