import ballerina/io;
// Anonymous function syntax.
var isOdd = function(int n) returns boolean {
return n % 2 != 0;
};
// Function type syntax.
type IntFilter function (int n) returns boolean;
// Module-level function definition.
function isEven(int n) returns boolean {
return n % 2 == 0;
}
public function main() {
// The `isEven` function referred as a value.
IntFilter f = isEven;
int[] nums = [1, 2, 3];
// Arrays provide the usual functional methods:
// `filter`, `map`, `forEach`, and `reduce`.
int[] evenNums = nums.filter(f);
io:println(evenNums);
// Shorthand syntax when the type is inferred and the body is an expression.
int[] oddNums = nums.filter(n => n % 2 != 0);
io:println(oddNums);
}
Function ValuesFunctions are values and work as closures Function type is a Separate basic type Anonymous function and type syntax look like function definition without the name. |
import ballerina/io;
var isOdd = function(int n) returns boolean {
return n % 2 != 0;
};
Anonymous function syntax.
type IntFilter function (int n) returns boolean;
Function type syntax.
function isEven(int n) returns boolean {
return n % 2 == 0;
}
Module-level function definition.
public function main() {
IntFilter f = isEven;
The isEven function referred as a value.
int[] nums = [1, 2, 3];
int[] evenNums = nums.filter(f);
Arrays provide the usual functional methods:
filter, map, forEach, and reduce.
io:println(evenNums);
int[] oddNums = nums.filter(n => n % 2 != 0);
Shorthand syntax when the type is inferred and the body is an expression.
io:println(oddNums);
}
bal run function_values.bal
[2]
[1,3]
