The code encountered an error with message TS2345 stating that the argument type '(a: Test, b: Test) => boolean | 1' cannot be assigned to a parameter type of '(a: Test, b: Test) => number'

Question

The code encountered an error with message TS2345 stating that the argument type '(a: Test, b: Test) => boolean | 1' cannot be assigned to a parameter type of '(a: Test, b: Test) => number'

Apologies for the lengthy subject, but I am having trouble understanding the response.

Here is my code snippet:

this.rezerwacjeFilteredByseaarchInput.sort(function (a, b) {
      if (a[5]===null) {
       // console.log(a[5]);
        return 1;

      }
        if (firmaSortOrder) {
          return a[5] > b[5];
        }
        else {
          return b[5] > a[5];
        }

    });

The JavaScript error message states: error TS2345: Argument of type '(a: Rezerwacja, b: Rezerwacja) => boolean | 1' is not assignable to parameter of type '(a: Rezerwacja, b: Rezerwacja) => number'. Type 'boolean | 1' is not assignable to type 'number'. Type 'true' is not assignable to type 'number'.

javascript typescript

Answer 1

Answer №1

As stated in the documentation on MDN about the sort function, the comparison function should return a number. While your initial condition returns a number, the other two conditions return boolean values. The revised code below should address this issue:

this.filteredReservations.sort(function (x, y) {
    if (x[5] === null) {
        return 1;
    }
    if (companySortOrder) {
        return x[5] - y[5];
    }
    return y[5] - x[5];
});

Answer 2

As stated in the documentation on MDN about the sort function, the comparison function should return a number. While your initial condition returns a number, the other two conditions return boolean values. The revised code below should address this issue:

this.filteredReservations.sort(function (x, y) {
    if (x[5] === null) {
        return 1;
    }
    if (companySortOrder) {
        return x[5] - y[5];
    }
    return y[5] - x[5];
});

Answer 3

Answer №2

Encountering a typescript compilation error due to an incorrect signature in the rezerwacjeFilteredByseaarchInput function. The error message specifies that the function should only return number values, yet within its implementation it also allows for boolean returns.

Answer 4

Encountering a typescript compilation error due to an incorrect signature in the rezerwacjeFilteredByseaarchInput function. The error message specifies that the function should only return number values, yet within its implementation it also allows for boolean returns.

The code encountered an error with message TS2345 stating that the argument type '(a: Test, b: Test) => boolean | 1' cannot be assigned to a parameter type of '(a: Test, b: Test) => number'

Answer №1

Answer №2

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