simple ways to sum an array of numbers in golang

Step 1: Loop through the Array
Loop through each element of the array to access its values.

Step 2: Declare the result Variable
Declare a variable result to store the cumulative sum. The type of this variable should match the type of the elements in the array (e.g., int, float64, etc.).

Step 3: Accumulate the Sum
Use the result variable to cumulatively sum each value in the array. For example: result += array[i].

Step 4: Return the Result
After the loop completes, return the result variable which now contains the sum of all elements in the array.

func sumArray(numbers []int) int {
    result := 0
    for i := 0; i < len(numbers); i++ {
        result += numbers[i]
    }
    return result
}

Testing our function

func TestSumArray(t *testing.T) {
    tests := []struct {
        name     string
        numbers  []int
        expected int
    }{
        {
            name:     "Positive numbers",
            numbers:  []int{1, 2, 3, 4, 5},
            expected: 15,
        },
        {
            name:     "Mixed numbers",
            numbers:  []int{-3, 4, -1, 0, 2},
            expected: 2,
        },
        {
            name:     "Single number",
            numbers:  []int{10},
            expected: 10,
        },
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            got := sumArray(tt.numbers)
            if got != tt.expected {
                t.Errorf("sumArray(%v) = %v, want %v", tt.numbers, got, tt.expected)
            }
        })
    }
}

Run your test with go test ./... command via your terminal or use the play button via your IDE

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