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toOrdinalSuffix

TS JS Deno

Adds an ordinal suffix to a number.

Use the modulo operator (%) to find values of single and tens digits. Find which ordinal pattern digits match. If digit is found in teens pattern, use teens ordinal.

typescript
const toOrdinalSuffix = (num) => {
const int = parseInt(num),
digits = [int % 10, int % 100],
ordinals = ["st", "nd", "rd", "th"],
oPattern = [1, 2, 3, 4],
tPattern = [11, 12, 13, 14, 15, 16, 17, 18, 19];
return oPattern.includes(digits[0]) && !tPattern.includes(digits[1])
? int + ordinals[digits[0] - 1]
: int + ordinals[3];
};
typescript
toOrdinalSuffix("123"); // "123rd"