🚀 Kotlin's Key Features #1

🏹 Null Safety in Kotlin
Dodging the Null Pointer Exception, the Kotlin way🤓🤓

➤ Concept of Strict Null Safety in Kotlin
• Safe Call Operator ( ?. ) in Kotlin
• Elvis Operator ( ?: ) in Kotlin
• Not Null Assertion ( !! ) in Kotlin.

• Kotlin allows to store “Null” values in a variable.
• In Kotlin, the variables can be made of Null types by just adding a “?” symbol to the right side of the data type.
• A nullable type variable means it can also hold “Null” as a value in it.
• A non-nullable type variable means that it can not hold “Null” as a value in it.

• The safe call operator is simply a question mark followed by a dot ( ?. )
• The safe call operator in Kotlin, is one of the methods to impose “Null Safety Checks” on the nullable variables.
• If the left-hand side of the operator is null, then it will return null value.
• If the left-hand side of the operator is not null, then it will return the result of the right-hand side expression.

• The elvis operator is represented by a question mark followed by a colon ( ?: )
• The elvis operator in Kotlin, is one of the methods to impose “Null Safety Checks” on the nullable variables.
• If the first operand is not null, then this operand will be returned by the elvis operator.
• If the first operand is null, then second operand will be returned by the elvis operator.

• The Not Null Assertion is represented by a double exclamation mark (!!)
• The Not Null Assertion in Kotlin, is another tool to deal with nullity.
• This operator explicitly casts nullable variables to non-nullable variables.