add new problem : check vowel or consonant (L-B)

L-B/0015 CheckVowelOrConsonant (L-B)/README.md

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+# Problem 15 (L-B) ~ Check Vowel or Consonant
+
+## Problem
+
+This program takes an *English* alphabet and informs the user if the given alphabet is a vowel or a constant.
+
+### Vowels
+
+A vowel is a letter that represents an open sound. When we make a vowel sound, we don't obstruct the airflow with the lips or tongue. In the English alphabet, there are five vowels and they are: **a**, **e**, **i**, **o**, and **u**.
+
+### Consonants
+
+In articulatory phonetics, a consonant is a speech sound that is articulated with complete or partial closure of the vocal tract.
+Examples of consonants are: **Z**, **B**, **T**, **G**, and **H**.

L-B/0015 CheckVowelOrConsonant (L-B)/checkVowelOrConsonant.js

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+const vowels = ["a", "e", "i", "o", "u", "A", "E", "I", "O", "U"];
+
+const checkVowelOrConsonant = (letter) => {
+ if (vowels.includes(letter)) {
+ return `${letter} is a VOWEL`;
+ } else {
+ return `${letter} is a CONSONANT`;
+ }
+};
+
+module.exports = checkVowelOrConsonant;

L-B/0015 CheckVowelOrConsonant (L-B)/checkVowelOrConsonant.test.js

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+const { strict: assert } = require("assert");
+
+const checkVowelOrConsonant = require("./checkVowelOrConsonant.js");
+
+assert.equal(checkVowelOrConsonant("a"), "a is a VOWEL");
+assert.equal(checkVowelOrConsonant("E"), "E is a VOWEL");
+assert.equal(checkVowelOrConsonant("b"), "b is a CONSONANT");
+assert.equal(checkVowelOrConsonant("C"), "C is a CONSONANT");
+
+console.log("All tests success");