Var a = "837297,870895"
Var b = "37297,36664"
OutPut = "837297_37297,870895_36664
I tried multiple script but does not working
You can split and map the splitted array as such:
var a = "837297,870895"
var b = "37297,36664"
var output = a.split(',').map((e,i)=> e+"_"+b.split(',')[i])
console.log(output.toString())For ES2015 or lower
var a = "837297,870895"
var b = "37297,36664"
var output = a.split(',').map(function(e,i){return e+"_"+b.split(',')[i]})
console.log(output.toString())You can start by converting the two strings (lists) into arrays using .map() and .split() methods.
Then use .map() and .join() methods to produce the desired string (list):
const a = "837297,870895";
const b = "37297,36664";
const [c,d] = [a,b].map(e => e.split(','));
const output = c.map((e,i) => `${e}_${d[i]}`).join();
console.log( output );