How to find the average of es6 array

Method: 1. Use the "arr.reduce(function(p,c){return p c;})" statement to calculate the sum of all elements in the array; 2. Use the "arr.length" statement, Calculate the number of array elements; 3. Use the "elements and/number of elements" statement to calculate the average of the array.

The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.

es6 method of averaging arrays

1. Use the reduce() function to calculate the sum of all elements in the array

var arr = [1,2,3,4,5,6,7,8,9,10];
console.log(arr);
var r = arr.reduce(function(pre, curr) {
    return pre + curr;
});
console.log("数组元素之和为："+r);

2. Use the length attribute to get the number of elements in the array, that is, the length of the array

var len=arr.length;
console.log("数组元素个数为："+len);

3. Divide the sum of elements by the number of elements to calculate the average

var average=r/len;
console.log("数组平均值为："+average);

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