HarmonyOS ArkTS中的array类型的filter如何使用？

export interface DragTableInfo { 
  st1: string 
  st2: string 
  success:boolean 
} 
 
@Entry 
@Component 
export struct DragTableTest { 
  @State datas: Array<DragTableInfo> = [{ st1: "测试1", st2: '测试2',success:true }, { st1: "测试3", st2: '测试4' ,success:true}, { st1: "测试5", st2: '测试6' ,success:false}] 
  @State nums: Array<number> = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 
 
  build() { 
    Column() { 
      ForEach(this.datas.filter((data)=>{ 
        return data.success == true 
      }),(item:DragTableInfo) =>{ 
        Text(item.st1).width('100%').height(50).textAlign(TextAlign.Center).fontSize(18).fontColor(Color.Red) 
      }) 
      Divider() 
      ForEach(this.nums.filter((item)=>{ 
        return item % 2 === 0 
      }),(item:Array<number>) =>{ 
        Text(item.toString()).width('100%').height(50).textAlign(TextAlign.Center).fontSize(18).fontColor(Color.Orange) 
      }) 
    }.width('100%').height('100%') 
  } 
}
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