node.js - How to add a common string in every randomly generated string Javascript -

i generating random strings using below function in node.js. wanted know if there way create text strings appropriately common string within every randomly generated string.

edit: common string can in location of generated string

for example:

randomly generated string - cxqtooxyy4

can add 'abc' or 'abc' within string - cxqtoabcoxyy4 or cxqtoabcoxyy4 respectively.

my code -

var randomtextarraygeneration = function(size) {     var text = "";     var possible = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789";     for(var i=0;i<size;i++)         text += possible.charat(math.floor(math.random() * possible.length));     return text; } 

can tell me how do this? helpful.

var n = text.length; //the size of random string var randomposition = math.floor((math.random() * n) + 1); //generate  random number between 1 , size of string  //separate string in 2 strings var text1 = text.substring(1, randomposition);  var text2 = text.substring(randomposition, n);   //create final string adding common string between 2 halves var textfinal = text1 + commonstring + text2;  return textfinal; 

i don't remember how works .substring(), may want change 1 0 in places.