JSFiddle - React, Tailwind, and code Playground

JavaScript

var strpara = 0;
var now;
var operations = 1000000;
now = new Date();

for(i=0;i< operations; i++)
{    
    if (strpara == '12' || strpara == '13' || strpara == '14' || strpara == '15') 
    $(".class-12-15").removeClass("hide");
}    
console.log(new Date().valueOf() - now.valueOf())
now = new Date();
for(i=0;i< operations; i++)
{    
    if (strpara >= '12' && strpara <= '15') 
        $(".class-12-15").removeClass("hide");
}    
console.log(new Date().valueOf() - now.valueOf())