JSFiddle - React, Tailwind, and code Playground

JavaScript

var a = [];
a[0] = "Hi may name is '%s' and my brother is '%d'";
a[1] = "John";
a[2] = "David";
var final = a[0];

for(var i = 1; i < a.length; i++) {
    final = final.replace(/\%[sd]/, a[i]);
}
alert(final);