JavaScript: Return the singular or plural form of the word based on the input number
JavaScript fundamental (ES6 Syntax): Exercise-164 with Solution
Write a JavaScript program that returns the singular or plural form of the word based on the input number.
If the first argument is an object, it will use a closure by returning a function that can auto-pluralize words that don't simply end in s if the supplied dictionary contains the word.
- Use a closure to define a function that pluralizes the given word based on the value of num.
- If num is either -1 or 1, return the singular form of the word.
- If num is any other number, return the plural form.
- Omit the third argument, plural, to use the default of the singular word + s, or supply a custom pluralized word when necessary.
- If the first argument is an object, return a function which can use the supplied dictionary to resolve the correct plural form of the word.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const pluralize = (val, word, plural = word + 's') => {
const _pluralize = (num, word, plural = word + 's') =>
[1, -1].includes(Number(num)) ? word : plural;
if (typeof val === 'object') return (num, word) => _pluralize(num, word, val[word]);
return _pluralize(val, word, plural);
};
pluralize(0, 'apple'); // 'apples'
pluralize(1, 'apple'); // 'apple'
pluralize(2, 'apple'); // 'apples'
pluralize(2, 'person', 'people'); // 'people'
const PLURALS = {
person: 'people',
radius: 'radii'
};
const autoPluralize = pluralize(PLURALS);
console.log(autoPluralize(2, 'person')); // 'people'
Sample Output:
people
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-163-1 by w3resource (@w3resource) on CodePen.
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