根据打字稿中的“输入”条件过滤数组元素

Question

I have an arrayList which contains employees information like employeename, grade, designation. I have a multiselect component in my view which returns an array of grades like [1,2,3] once we choose grade1 , grade2 , grade3 from the multiselect dropdown. Is there a way to filter my employeelist based on these grades array? Similar like this:

this.employeeList.filter(x=> x.grade in (grade1,grade2,grade3));

Or is there otherway to acheive this? Basically I need to filter my employeelist based on multiselect values. Please suggest as I am new to typescript. Your help is very much appreciated.

Answer 1

When you deal with regular variables, you can just wrap them into additional array [var1, var2, ...] and use includes() for check:

 const grade1 = 1, grade2 = 2, grade3 = 3; const employeeList = [ { grade: 1 }, { grade: 3 }, { grade: 4 }, { grade: 8 }, { grade: 9 } ]; const result = employeeList.filter(x => [grade1,grade2,grade3].includes(x.grade)); console.log(result) // should print the array with objects {"grade": 1} and {"grade": 3} 

Answer 2

我只会使用类似：

x => [grade1,grade2,grade3].indexOf(x) != -1