对象去重与数组去重

对象去重

对象样式：{ {}, {} }

// 对象去重
export const delRepeat = (data) => {
  let keys = Object.keys(data);
  let set = new Set();
  let arrs = [];
  keys.forEach(key => {
    set.add(data[key]);
    arrs.push(data[keys]);
    if ([...set].length !== arrs.length) {
      delete data[key];
      arrs = [...set];
    }
  });
  return data;
};

数组去重

数组样式 [ {} , {} ]

// 数组去重
export const uniqueByKey = (arr, key) => {
  let hash = {};
  let result = arr.reduce((total, currentValue) => {
    if (currentValue && currentValue[key]) {
      if (!hash[currentValue[key]]) { // 如果当前元素的key值没有在hash对象里，则可放入最终结果数组
        hash[currentValue[key]] = true; // 把当前元素key值添加到hash对象
        total.push(currentValue); // 把当前元素放入结果数组
      } else {
        total.push({});
      }
    }
    return total; // 返回结果数组
  }, []);
  return result;
};