Avoid use assert in node.js to detect if a function parameters is defined.

avoid_assert_parameters.js

/*
  In this example I show how avoid to use assert in nodejs to validate if the parameter is defined.
*/

//Star from here.
const assert = require('assert');

//Using with assert
const sum3 = (a,b,c)=>{

   assert(a,'a is required');
   assert(b,'b is required');
   assert(c,'c is required');

   return a+b+c;

}

//Error c is missing.
sum3(1,2);


//Move to ....
//A function that is call when the parameter is missing.
const required = ()=>{throw new Error('Parameter value required');};

//Required parameter validation in arrow functions
const sum3 = (a = required(),b = required(), c= required())=>a+b+c;

//Parameter value required.
sum3(1,2);