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<p>创建一个名为 <code>ArrayWrapper</code> 的类,它在其构造函数中接受一个整数数组作为参数。该类应具有以下两个特性:</p>
<ul>
<li>当使用 <code>+</code> 运算符将两个该类的实例相加时,结果值为两个数组中所有元素的总和。</li>
<li>当在实例上调用 <code>String()</code> 函数时,它将返回一个由逗号分隔的括在方括号中的字符串。例如,<code>[1,2,3]</code></li>
</ul>
<p>&nbsp;</p>
<p><strong class="example">示例 1</strong></p>
<pre>
<b>输入:</b>nums = [[1,2],[3,4]], operation = "Add"
<b>输出:</b>10
<b>解释:</b>
const obj1 = new ArrayWrapper([1,2]);
const obj2 = new ArrayWrapper([3,4]);
obj1 + obj2; // 10
</pre>
<p><strong class="example">示例 2</strong></p>
<pre>
<b>输入:</b>nums = [[23,98,42,70]], operation = "String"
<b>输出:</b>"[23,98,42,70]"
<strong>解释:</strong>
const obj = new ArrayWrapper([23,98,42,70]);
String(obj); // "[23,98,42,70]"
</pre>
<p><strong class="example">示例 3</strong></p>
<pre>
<b>输入:</b>nums = [[],[]], operation = "Add"
<b>输出:</b>0
<strong>解释:</strong>
const obj1 = new ArrayWrapper([]);
const obj2 = new ArrayWrapper([]);
obj1 + obj2; // 0
</pre>
<p>&nbsp;</p>
<p><b>提示:</b></p>
<ul>
<li><code>0 &lt;= nums.length &lt;= 1000</code></li>
<li><code>0 &lt;= nums[i]&nbsp;&lt;= 1000</code></li>
<li><code>注意nums 是传递给构造函数的数组。</code></li>
</ul>