prefer_function_declarations_over_variables
Use a function declaration rather than a variable assignment to bind a function to a name.
Description
#The analyzer produces this diagnostic when a closure is assigned to a local variable and the local variable is not re-assigned anywhere.
Example
#The following code produces this diagnostic because the local variable f
is initialized to be a closure and isn't assigned any other value:
void g() {
var f = (int i) => i * 2;
f(1);
}
Common fixes
#Replace the local variable with a local function:
void g() {
int f(int i) => i * 2;
f(1);
}
Unless stated otherwise, the documentation on this site reflects Dart 3.7.3. Page last updated on 2025-05-08. View source or report an issue.