待去重數(shù)組

let array = [{
  code: '1111',
  value: '海山城1111'
}, {
  code: '2222',
  value: '海山城2222'
}, {
  code: '3333',
  value: '海山城3333'
},{
  code: '4444',
  value: '海山城4444'
},{
  code: '1111',
  value: '海山城1111'
},{
  code: '4444',
  value: '海山城4444'
}];

• 方法一：for循環(huán)

/**
 * @description: 數(shù)組對象去重
 * @param array: 待去重數(shù)組
 * @param key: 數(shù)組的對象以此key去重
 * @return: 去重后的數(shù)組
 */
removeDuplication = (array, key) => {
  let result = []
  let keyArray = []
  for (let i in array){  
    if (!keyArray.includes(array[i][key])) {
      result.push(array[i])
      keyArray.push(array[i][key])
    }
  }
  return result
};

let result = removeDuplication (array, 'code')
console.log("result", result)

• 方法二：reduce

/**
 * @description: 數(shù)組對象去重
 * @param array: 待去重數(shù)組
 * @param key: 數(shù)組的對象以此key去重
 * @return: 去重后的數(shù)組
 */
removeDuplication = (array, key) => {
  let keyMap = {};
  return array.reduce(function(accumulator, currentValue) {
    if (!keyMap[currentValue[key]]) {
      accumulator.push(currentValue);
      keyMap[currentValue[key]] = true;
    }
    return accumulator;
  }, []);
};
let result = removeDuplication (array, 'code')
console.log("result", result)