append char to string javascript code example

Example 1: add char in specific index stirng javascript

int j = 123456;
String x = Integer.toString(j);
x = x.substring(0, 4) + "." + x.substring(4, x.length);

//output : 1234.56

Example 2: string concatenation in js

var str1 = "Hello ";
var str2 = "world!";
var res = str1.concat(str2);
console.log(res);

Example 3: javascript add to string

var s = 'hell'
s = s + 'o'

Example 4: string concatenation js

var aString="";
aString.concat(value1, value2, ... value_n);