Real-world examples of the Builder pattern

Question

I would like to see how is Builder pattern used in real world applications/APIs. The examples I found are all pizzas, cakes, cars et cetera (plus the parser example from the GoF

Answer 1

Actually a very good real-life example is Active Record QueryBuilder example.

You can dig into the Laravel Eloquent module and check those Query builder classes...

A quick example of how it could look:

interface SqlQueryBuilder
{
    public function select(string $table, array $fields): SqlQueryBuilder;

    public function where(string $field, string $value, string $operator = '='): SqlQueryBuilder;

    public function limit(int $start, int $offset): SqlQueryBuilder;

    // ... other methods

    public function getSQL(): string;
}

class MysqlQueryBuilder implements SqlQueryBuilder
{
    // ...
}

class PostgresQueryBuilder extends MysqlQueryBuilder
{
    // ...
}