how to restart a for in loop iteration in javascript

Question

I need to restart the loop every time the if statement occurs so that the correct roman numeral conversion works

by pushing the key(roman numeral) of the iterator to counter, and by subtracting the value of the iterator from the input num then I want the loop to start again from the beginning


let conversionChart = {
  m:1000,
  cm:900,
  d:500,
  cd:400,
  c:100,
  xc:90,
  l:50,
  xl:40,
  x:10,
  ix:9,
  v:5,
  iv:4,
  i:1
}

let newArr = [];
let counter = [];

for(let i in conversionChart){
  if(num >= conversionChart[i]){
    counter.push(i)
    num = num - conversionChart[i]
    continue;
    }
   }




 return counter
}

console.log(convertToRoman(36));```

This is not a minimal reproducible example (where's the function)? Why do you loop over conversionChart when num is the actual important thing? — Andreas
– Andreas, Commented Aug 23, 2022 at 11:08

AKX · Accepted Answer · 2022-08-23 11:10:16Z

0

You'd need to wrap that loop in another loop that continues for as long as there is something to convert:

let conversionChart = {
  m: 1000,
  cm: 900,
  d: 500,
  cd: 400,
  c: 100,
  xc: 90,
  l: 50,
  xl: 40,
  x: 10,
  ix: 9,
  v: 5,
  iv: 4,
  i: 1,
};

function convertToRoman(num) {
  const counter = [];
  // while there is still something to convert...
  while (num > 0) {
    for (let romanNumeral in conversionChart) {
      if (num >= conversionChart[romanNumeral]) {
        counter.push(romanNumeral);
        num = num - conversionChart[romanNumeral];
        break;  // ... out of the inner "romanNumeral ..." loop
      }
    }
  }
  return counter.join("");
}

console.log(convertToRoman(36));

answered Aug 23, 2022 at 11:10

AKX

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