js数组求平均值

function calculateAverage(arr) {
    if (!Array.isArray(arr) || arr.length === 0) {
        throw new Error('Input must be a non-empty array');
    }

    // 使用reduce方法计算数组元素的总和
    const sum = arr.reduce((accumulator, currentValue) => {
        // 确保当前值是数值类型
        if (typeof currentValue !== 'number') {
            throw new Error('All elements in the array must be numbers');
        }
        return accumulator + currentValue;
    }, 0);

    // 计算平均值
    const average = sum / arr.length;
    return average;
}

// 示例使用
const numbers = [1, 2, 3, 4, 5];
const avg = calculateAverage(numbers);
console.log(`The average is: ${avg}`); // 输出: The average is: 3