rounding of, limiting or moving comma. JS string in html form.

Question

Hi.
Put my calculator here.
If you get a too big number, it goes wider than the display. I would like to limit the number of decimals in the answer, to make it fit the display. Any suggestions?

There is also a check for operator, in the inp() function. I guess its not the prettiest way of doing it. Would love some feedback on that one too.

Thanks for looking.

https://code.sololearn.com/WJMT3qoIQunw/

Answer 1

function inp(val=""){
//check to see if last input is an operator
// let s = document.getElementById("display").value; (use only "display")
let s = display.value;
//If val is an operator. Check if last input was an operator
if('+-*/'.includes(val) && val != ''){

let r = s.charAt(s.length -1); // I do different, see my code
// if(r=='+'||r=='-'||r=='*'||r=='/'){ not use
//remove old operator and add new operator
// display.value = s.slice(0, -1);
// display.value += val;
// }
// else{ not use
display.value += val;
// }
}
else{
display.value += val;
}
}

function solve() {
let x = eval(display.value);
let y = x.toPrecision();

if(y.includes('.'))
y = x.toPrecision(4);

display.value = y;
}

// My similar code
https://code.sololearn.com/WV382uzpTslU/#js

// Your code is good, create more project and more learn.

Answer 2

Cool. Thanks👍
Knew ut could be done easier 😉