js数组去重

1.数组去重

var arr = ['1','2','3','13','4','2','0','7','6','3','2'];
Array.prototype.unique = function() {
  var temArr = new Array();
  for(var i in this) {
    if(typeof this[i] !== 'function' && temArr.join(',').indexOf(this[i]) < 0) {
      temArr.push(this[i]);
    }
  }
  return temArr;
}
function unique1(arr) {
  return Array.from(new Set(arr));
}
console.info(arr.unique());
console.info(unique1(arr));



>>>["1", "2", "3", "13", "4", "0", "7", "6"]
>>>["1", "2", "3", "13", "4", "0", "7", "6"]

2.对象数组去重

 

const arr = [{id: 1},{id: 2},{id: 3},{id: 2}];

const hash = {};

const arrResult = arr.reduce((preVal, curVal) => {

　　hash[curVal.id] ? '' : hash[curVal.id] = true && preVal.push(curVal);

　　return preVal;

}, []);

console.info(arrResult);

 

 

>>> [{id: 1},{id: 2},{id: 3}]

转载于:https://www.cnblogs.com/Alice-Xu/p/8798861.html