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) {
        ......
    }
}

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MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b35e29-3437c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35e29-3437c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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