What does javascript arrow function concatenate mean?

What does the

javascript arrow function concatenate mean? I don"t understand it all the time. Please tell me more about it. The code is as follows: 

let CURRENT = "NULL";
const renderAuthorize = Authorized => currentAuthority => {  //
  if (currentAuthority) {
    if (typeof currentAuthority === "function") {
      CURRENT = currentAuthority();
    }
    if (
      Object.prototype.toString.call(currentAuthority) === "[object String]" ||
      Array.isArray(currentAuthority)
    ) {
      CURRENT = currentAuthority;
    }
  } else {
    CURRENT = "NULL";
  }
  return Authorized;
};

export { CURRENT };
export default Authorized => renderAuthorize(Authorized);
The

question is the arrowhead function of the second line of code. What does it mean?

Javascript
Nov.26,2021

indicates that the returned value is a function
for example 

const a = b => c=> b + c
es5  
var a = function(b){
    return function(c){
        return b + c
    }    
}

higher-order functions, which often appear in Corialization and local applications

"Corey" get to know it.

Corification-Wikipedia, Free Encyclopedia

you can make it clear by adding parentheses after braces in the arrow function, such as const a = (b) = > {return (c) = > {return d}}, = > arrow is preceded by parameter, and = > arrow is followed by return 

var renderAuthorize = function(Authorized) {
    return function(currentAuthority) {
        //code....
    };
  };
const renderAuthorize = function (Authorized) {
    return function (currentAuthority) {
        ......
    }
}

Previous: Vue-cli3 environment mode and variable undefine

Next: When ant design Table fixed the column header, the width exceeded

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e53aa6-437ff.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e53aa6-437ff.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?