import ballerina/io;
type Person record {
string first;
string last;
int yearOfBirth;
};
public function main() {
Person[] persons = [
{first: "Melina", last: "Kodel", yearOfBirth: 1994},
{first: "Tom", last: "Riddle", yearOfBirth: 1926}
];
// A `Person` record is destructured here, as a
// projection with `first` and `last` fields.
// `{first: f, last: l}` is the `binding pattern`.
var names1 = from var {first: f, last: l} in persons
select {first: f, last: l};
io:println(names1);
// The same can be simplified as this.
var names2 = from var {first, last} in persons
select {first, last};
io:println(names2);
}
Destructuring RecordsDestructuring records is particularly useful with |
import ballerina/io;
type Person record {
string first;
string last;
int yearOfBirth;
};
public function main() {
Person[] persons = [
{first: "Melina", last: "Kodel", yearOfBirth: 1994},
{first: "Tom", last: "Riddle", yearOfBirth: 1926}
];
var names1 = from var {first: f, last: l} in persons
select {first: f, last: l};
A Person record is destructured here, as a
projection with first and last fields.
{first: f, last: l} is the binding pattern.
io:println(names1);
var names2 = from var {first, last} in persons
select {first, last};
The same can be simplified as this.
io:println(names2);
}
bal run destructuring_records.bal
[{"first":"Melina","last":"Kodel"},{"first":"Tom","last":"Riddle"}]
[{"first":"Melina","last":"Kodel"},{"first":"Tom","last":"Riddle"}]
