Introduction to the usage of JavaScript high-order functions

This article brings you an introduction to the usage of JavaScript high-order functions. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Higher-order functions are functions that can pass functions as parameters

Ideas:

1. Pass parameters and a processing function to the high-order function
2 , the processing function processes each parameter

Usage scenario:
Want to get the squared array of each number in the array

var process = function (array, processor) { var l = [] for (var i = 0; i 
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