function for generate customized random string. Works flowless in browser and with nodeJs

#random-string.v1.js

function randomString(len=9, matrix='qwertyuiopasdfghjklzxcvbnm1234567890QWERTYUIOPASDFGHJKLZXCVBNM_-.#@'){
		var ret='';
		for(var i=0;i<len;i++){
			ret+=matrix.charAt(Math.floor(Math.random()*matrix.length));
		}
		return ret;
	}

#random-string.v2.js

function randomString(l=15, F="!".charCodeAt(0), L="~".charCodeAt(0)){
		var o="";
	  	while(l--)o+=String.fromCharCode(Math.floor(Math.random()*(L-F)+F));
	  	return o;
	}

#random-string.v3.js

function randomString(l=15, F="!".charCodeAt(0), L="~".charCodeAt(0)){
  var a=new Array(l);
  var r=function(x){
    //console.log(Math.random()*(L-F)+F);
    return Math.random()*(L-F)+F;
  }
  var o=a.fill(0).map(r);
  return String.fromCharCode(...o);
}

#random-string.v4.js

function randomString(l=15, F="!", L="~"){
  return String.fromCharCode(...Array(l).fill(0).map(function(){
    return Math.random()*(L.charCodeAt(0)-F.charCodeAt(0))+F.charCodeAt(0);
  }));
}

example.js

/*
EXAMPLE BEGINE
*/
console.log(randomString.v1());
console.log(randomString.v1(7));
console.log(randomString.v1(3));
console.log(randomString.v1(30));
console.log(randomString.v1(9, "1234567890"));
console.log(randomString.v1(13, ",./;'[]-=\\|}{+_:\"?><"));
console.log(randomString.v4(30, "A", "D"));
/*
EXAMPLE END
*/