import ballerina/io;
//`var` says that the type of the variable is from the type of expression
// used to initialize it.
var x = "str";
function printLines(string[] sv) {
// Type inference with a `foreach` statement.
foreach var s in sv {
io:println(s);
}
}
public function main() {
string[] s = [x, x];
printLines(s);
// Infers `x` as the `MyClass` type.
var x = new MyClass();
// Infers the class for `new` as `MyClass`.
MyClass y = new;
}
class MyClass {
function foo() {
}
}
Type InferenceType inference is local and restricted to a single expression. Overuse of type inference can make the code harder to understand. |
import ballerina/io;
var x = "str";
var says that the type of the variable is from the type of expression
used to initialize it.
function printLines(string[] sv) {
foreach var s in sv {
io:println(s);
}
Type inference with a foreach statement.
}
public function main() {
string[] s = [x, x];
printLines(s);
var x = new MyClass();
Infers x as the MyClass type.
MyClass y = new;
Infers the class for new as MyClass.
}
class MyClass {
function foo() {
}
}
bal run type_inference.bal
str
str
