Detailed explanation of JavaScript array deduplication

      /**************************************************
         ╚description:
        ╚Author: Qilin Society╚Time: 2021-09-13 22:26:21
        ╚Name: V1.0.5
        ***************************************************/
        var obj = ['Qilin','She','CC','DD','Qilin','She','11',11]
            //Define a new array var s = [];
            //Traverse the array for(var i=0;i<obj.length;i++){
            if(s.indexOf(obj[i]) == -1){ //Judge whether it exists in the s array, if not, push it into the s array s.push(obj[i]);
             }
            }
        console.log(s); 

       /**************************************************
         ╚description:
         ╚Author: Qilin Society╚Time: 2021-09-13 22:26:21
         ╚Name: V1.0.5
        ***************************************************/
        var old_data = [
            { name:'ccc', age:'18' },
            { name:'peng', age:'18' }, //Remove duplicate peng { name:'aaa', age:'18' },
            { name:'peng', age:'18' },
          ]
          // Method 1: Use the object access attribute method to determine whether the key exists in the object
          var result = [];
          var obj = {};
          old_data.forEach(function (data) {
          if(!obj[data.name]){
          result.push(data);
          obj[data.name] = true;
            }
          })
          console.log(result); 

      /**************************************************
        ╚description:
        ╚Author: Qilin Society╚Time: 2021-09-13 22:26:21
        ╚Name: V1.0.5
        ***************************************************/
        var oldData = [
            { name:'cccc', age:'5656' },
            { name:'cccc', age:'22dddsada' },
            { name:'cccc', age:'22dddsada' },
            { name:'aaaa', age:'32' },
            { name:'aaaa', age:'2dasdasdas2' },
          ]
          var newArr = [];
          for (var i = 0; i < oldData.length; i++) {
          var item = oldData[i];
          var isExists = false;
          for (var j = 0; j < newArr.length; j++) {
          var item2 = newArr[j];
          if (item2.name == item.name) {
          isExists = true;
          break;
                }
            }
          if (isExists) {
          // Find the same here, change the same if(item.name == 'cccc'){
          item.age = '222222'
          item2.age = '222222'
                }else{
          item.age = '3333'
          item2.age = '3333'
                }
          newArr.push(item2);
          continue;
            }
          newArr.push(item);
          }
          console.log(newArr)