JavaScript-Algorithms-and-Data-Structures-Projects-Roman-Numeral-Converter

Roman Numeral Converter
Convert the given number into a roman numeral.

Forming Numbers - The Rules

When a symbol appears after a larger (or equal) symbol it is added

Example: VI = V + I = 5 + 1 = 6 Example: LXX = L + X + X = 50 + 10 + 10 = 70 But if the symbol appears before a larger symbol it is subtracted

Example: IV = V − I = 5 − 1 = 4 Example: IX = X − I = 10 − 1 = 9 To Remember: After Larger is Added

Don't use the same symbol more than three times in a row

How to Convert to Roman Numerals

Break the number into Thousands, Hundreds, Tens and Ones, and write down each in turn.

💬 Hint: 1
Creating two arrays, one with the Roman Numerals and one with the decimal equivalent for the new forms will be very helpful.

💬 Hint: 2
If you add the numbers to the arrays that go before the new letter is introduced, like values for 4, 9, and 40, it will save you plenty of code.

💬 Hint: 3
You can’t have more than three consecutive Roman numerals together.

function convertToRoman(num) {
//convert num to a roman numberal
console.log(num);
 return num;
}

convertToRoman(36);
convertToRoman(2); // should return "II".  
convertToRoman(3); // should return "III".  
convertToRoman(4); // should return "IV".  
convertToRoman(5); // should return "V".  
convertToRoman(9); // should return "IX".  
convertToRoman(12); // should return "XII".  
convertToRoman(16); // should return "XVI".  
convertToRoman(29); // should return "XXIX".  
convertToRoman(44); // should return "XLIV".  
convertToRoman(45); // should return "XLV"  
convertToRoman(68); // should return "LXVIII"  
convertToRoman(83); // should return "LXXXIII"  
convertToRoman(97); // should return "XCVII"  
convertToRoman(99); // should return "XCIX"  
convertToRoman(400); // should return "CD"  
convertToRoman(500); // should return "D"  
convertToRoman(501); // should return "DI"  
convertToRoman(649); // should return "DCXLIX"  
convertToRoman(798); // should return "DCCXCVIII"  
convertToRoman(891); // should return "DCCCXCI"  
convertToRoman(1000); // should return "M"  
convertToRoman(1004); // should return "MIV"  
convertToRoman(1006); // should return "MVI"  
convertToRoman(1023); // should return "MXXIII"  
convertToRoman(2014); // should return "MMXIV"  
convertToRoman(3999); // should return "MMMCMXCIX" 

1       I  
5       V  
10      X  
50      L  
100     C  
500     D  
1000    M  

switch(true)

for(var i = len; i--;) {
    var str = strs[i];
    
    switch(true) {
        case /p{2}le/.test(str):
            var some_var = 'found apple';
            break;
        case /(an){2}a/.test(str):
            var some_var = 'found banana';
            break;
        case /^[a-z][a-z][a-z][a-z]$/.test(str):
            var some_var = 'found pear';
            break;
        case (str.indexOf("lemon") != -1):
            var some_var = 'found lemon';
            break;
        case /ape/.test(str):
            var some_var = 'found grape';
            break;
        default:
            var some_var = 'found else (orange)';
    }  
}