JS's reduce method, change the first-class function

The first-class function : To encode programming like building blocks, you can use very little code to implement powerful functions.

eg

Gettotal: The sum operation of the array.

var myArray = [1,2,3,4];

var add = function (A, b) {

return a + B;

}

var gettotal = function (arr) {

Retuurn arr.reduce (add);

}

Gettotal (MyArray); ====>10

By passing the Add function as an argument to the reduce function, you can make a more useful compound function, achieve a higher level of general purpose, and avoid unnecessary duplication.

JS's reduce method, change the first-class function