Sequences in kotlin

Background

• There are many ways to handle a group of items.
• Collections and Sequences provide many utilities.
• Eagerly with the collections and Lazily with sequences.

Difference b/w Eagerly and Lazy

• Depends on when the transformation is performed on the collection

Collection use Eagerly

• On each operation, A new collection is formed and modified based on the operator's nature.
• Operations on the collections are implemented using inline functions.

Sequences use Eagerly

• Sequence is created based on the iterator of the original collection.
• So we need to add asSequence()
• The operations are added to the list of operations to be performed but the operations are not performed immediately
• Instead, the Terminal operator is applied first if it contains it, and thus map is not applied if it contains it.
• Also new copy is not created on each operator invocation.
• Each operation is not an inline function.