数组去重

今天处理下数组的去重。

基础款

要求

输入in ===> list = [1,2,3,1]
输出out ===> unionList = [1,2,3]

进阶

要求：

输入in ===> list = [{x: 1, y: 2},{x: 1, y: 1},{x: 1, y: 1}]
输出out ===> unionList = [{x: 1, y: 2},{x: 1, y: 1}]

究极体

要求：

输入in ===> list = [
    {
        code: 1,
        name: '哈',
      	batch: '1-1',
      	other: 'yiyi',
    },
  	{
        code: 1,
        name: '哈',
      	batch: '1-2',
      	other: 'yier',
    },
  	{
        code: 1,
        name: '哈',
      	batch: '1-1',
      	other: 'yier',
    },
  	{
        code: 2,
        name: '呵',
      	batch: '2-1',
      	other: 'eryi',
    }
]

primaryKey: code + batch

输出out ===> unionList = [
    {
        code: 1,
        name: '哈',
      	batch: '1-1',
      	other: 'yiyi',
    },
  	{
        code: 1,
        name: '哈',
      	batch: '1-2',
      	other: 'yier',
    },
  	{
        code: 2,
        name: '呵',
      	batch: '2-1',
      	other: 'eryi',
    }
]