How to use Elvis Operator with Let in Kotlin

How to use Elvis Operator "?:"

object ? :  "return something if object is null”

Example:

var abc: String? = null
print(abc?:"hello world")
//output: hello world

Use Elvis Operator with Let:

 var str: String? = null
 str?.let { 
   // this block will beexecutedd when str is not null
 }?:{
  // do something when str is null
 }

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