Question

How to handle invalid argument in Go

Answer 1

package main

import "fmt"

func CreateNewSquareMatrix(N int) ([][]float64, error) {
	if N < 0 {
		return nil, fmt.Errorf("Invalid size %d: cannot be negative", N)
	}
	matrix := make([][]float64, N)
	for i := range matrix {
		matrix[i] = make([]float64, N)
	}
	return matrix, nil
}

func main() {
	N1 := 4
	matrix1, err1 := CreateNewSquareMatrix(N1)
	if err1 == nil {
		fmt.Println(matrix1)
	} else {
		fmt.Println(err1)
	}

	N2 := -3
	matrix2, err2 := CreateNewSquareMatrix(N2)
	if err2 == nil {
		fmt.Println(matrix2)
	} else {
		fmt.Println(err2)
	}
}



/*
run:

[[0 0 0 0] [0 0 0 0] [0 0 0 0] [0 0 0 0]]
Invalid size -3: cannot be negative

*/

 

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