JSFiddle - React, Tailwind, and code Playground

HTML

<div id="console-log"></div>

CSS

.console-line
{
    font-family: monospace;
    margin: 2px;
}

JavaScript

var consoleLine = "<p class=\"console-line\"></p>";
 
console = {
    log: function (text) {
        $("#console-log").append($(consoleLine).html(text));
    }
};
console.log("### TEST int parmas ###");
var param = 1;
test(param);

function test(param){
    
    var tmp = param;
    console.log("before int tmp : " + tmp);
    
    tmp = tmp +1;
    
    console.log("after int tmp : " +tmp);
    console.log("after int param : " +param);
}

console.log("quit int param : " + param);

console.log("### TEST int Array parmas ###");
var params = [1,2,3]
testarr(params);

function testarr(params){
    var tmparr = params;
    
    console.log("before int tmparr : " + tmparr);
    
    tmparr[2]=1;
    
    console.log("after int tmparr : " + tmparr);
    console.log("after int params : " + params);
    
}

console.log("quit int params : " + params);