在数组角上逐个字母地过滤

Question

I am trying to filter letter by letter on an array as below

MyJSON

"mainArr":[  
       {  
          "data":false,
          "myArr":[  
             {  
                "myNumber": 12345,
             },
             {
                "myNumber": 8961,
             }
          ]
       }
    ]

And here is code which I am drafting below for search but unable to pick object based on letter keypress or key down or ion-input

    if (filterVal && filterVal.trim() !== '') {
        this.myArray = this.myArray.filter(function (item) {
          const results: any = [];
          const obj = item.mainArr[0];
          if (_.has(obj, 'myArr')) {
            console.log(obj.myArr.indexOf(filterVal));

            for (let i = 0; i < obj.myArr.length; i++) {
               if (obj.myArr.indexOf(filterVal) !== -1)
                 return results.push(obj.myArr[i]);
               }
            }
          }
        });
      }

Refered URL

Answer 1

Tried another way of implementing it, but backspace is not re-binding to original array

let results: any = [];
events.subscribe('filterSearch', (filterVal: string) => {
  if (filterVal && filterVal.trim() !== '') {
    results = Object.assign(this.allEventsSorted.filter(function (item: any): any {
      const fltDty = item.mainArr[0];

      if (_.has(fltDty, 'myArr')) {
        return _.some(
          item.mainArr[0].myArr,
          function (tag): any {
            return _.startsWith(tag.myNumber, filterVal);
            // return _.includes(tag.myNumber, filterVal);
          }
        );
      }
    }));
    this.allEventsSorted = results;
  }
});