JavaScript: Add an ordinal suffix to a number

JavaScript fundamental (ES6 Syntax): Exercise-122 with Solution

Write a JavaScript program to add 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.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2

// Define the 'toOrdinalSuffix' function.
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];
};

// Test the 'toOrdinalSuffix' function with sample inputs.
console.log(toOrdinalSuffix('1')); // Output: 1st
console.log(toOrdinalSuffix('4')); // Output: 4th
console.log(toOrdinalSuffix('50')); // Output: 50th
console.log(toOrdinalSuffix('123')); // Output: 123rd

Output:

1st
4th
50th
123rd

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-122-1 by w3resource (@w3resource) on CodePen.

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