What is a State - devrath/ComposeAlchemy GitHub Wiki

State

• Almost all the applications update the UI dynamically, In the jetpack compose, We manage it by modifying the state.
• State can exist over time and change course over time.

var text by remember{ mutableStateOf("") }

• What Remember does is, It makes the variable exist over time in recompositions.
• What mutableStateOf does is, It tells that it can change and it is like the mutableLiveData but we explicitly do not need to observe it.
• what by does is, It is a delegation property.

State vs Variables

• In declarative languages(ex: Compose), State is referred to as something that can change over time.
• The State differs from a normal variable in 2 different ways.
  • A state in a composable function needs to be remembered so that it can be used across the compositions.
  • Another thing is state in the UI has consequences in the entire view hierarchy

State,MutableState,MutableStateOf

State

• Its read-only value T.
• It notifies composition and observers when the value changes.

MutableState

• It is an extension of the state.
• Here we can update the value of the state to a new value.
• It notifies composition and observers when the value changes.

MutableStateOf

• It is same as mutableState but it has a initial value.