# 字符串集合 collection
Testing Is Documentation
Uses
<?php
use Leevel\Support\TypedStringArray;
# 基本使用
public function testBaseUse(): void
{
$data = [
'h', 'l', 'w', 'd',
];
$collection = new TypedStringArray($data);
$this->assertSame($collection[0], 'h');
$this->assertSame($collection[1], 'l');
$this->assertSame($collection[2], 'w');
$this->assertSame($collection[3], 'd');
$this->assertTrue(isset($collection[0]));
$this->assertTrue(isset($collection[1]));
$this->assertTrue(isset($collection[2]));
$this->assertTrue(isset($collection[3]));
}