I'm trying to create a function to generate a unique number every time using Typescript. The arithmetic is often incorrect for some reason. I've expanded the logic below and suspect that it has something to do with Typescript/Javascript's number type or Math.ceil(). I'd be grateful if someone could educate me.

function nonce(){
    const millidate = (new Date()).getTime();
    const factor:number = 10000;
    const codeTime:number = +millidate*factor;
    const codeEnd:number = Math.ceil(Math.random()*factor);
    const codeMult:number = Math.ceil(Math.random()*10);
    const codeBody:number = codeTime+codeEnd;
    const code:number =  codeBody*codeMult;
    console.log("Breakdown of " + code + ": ", codeTime, codeEnd, codeBody, codeMult);
    return code;
};


nonce();

Image of some tests in Playground

I was using Typescript's Playground to test this, but its performance seems to be the same across different environments.