2023 07 26

2023-07-26

Scala Enumeration Duplication

java.lang.AssertionError: assertion failed: Duplicate id: 231
at scala.Enumeration$Val.<init>(Enumeration.scala:254)
at scala.Enumeration$Val.<init>(Enumeration.scala:251)

• Enumerations - if you have an enumeration in your code, it's possible that you are trying to create a new enumeration value with an ID that already exists. - Enumerations in Scala should have unique values, and if you attempt to create a duplicate, it could trigger this assertion error.

Frontend BackButtonAction

• preventGoBack
• history API
  • pushState

• window
  • location
  • addEventListener
  • removeEventListener

• navigate
  • navigate(-1)

JS 함수 종류

JS let, const, var

JS async, await, promise

Batch