Added my library.

hackerrank/10 Days of JavaScript/0 - Data Types.js

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+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+'use strict';
+
+process.stdin.resume();
+process.stdin.setEncoding('utf-8');
+
+let inputString = '';
+let currentLine = 0;
+
+process.stdin.on('data', inputStdin => {
+    inputString += inputStdin;
+});
+
+process.stdin.on('end', _ => {
+    inputString = inputString.trim().split('\n').map(string => {
+        return string.trim();
+    });
+
+    main();
+});
+
+function readLine() {
+    return inputString[currentLine++];
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */
+
+/* All three parameters to this function are strings. */
+function performOperation(secondInteger, secondDecimal, secondString) {
+    const firstInteger = 4;
+    const firstDecimal = 4.0;
+    const firstString = 'HackerRank ';
+
+    console.log(firstInteger + parseInt(secondInteger));
+    console.log(firstDecimal + parseFloat(secondDecimal));
+    console.log(firstString + secondString);
+}
+
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+function main() {
+    const secondInteger = readLine();
+    const secondDecimal = readLine();
+    const secondString = readLine();
+
+    performOperation(secondInteger, secondDecimal, secondString);
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */

hackerrank/10 Days of JavaScript/0 - Hello World.js

@@ -0,0 +1,42 @@
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+'use strict';
+
+process.stdin.resume();
+process.stdin.setEncoding('utf-8');
+
+let inputString = '';
+let currentLine = 0;
+
+process.stdin.on('data', inputStdin => {
+    inputString += inputStdin;
+});
+
+process.stdin.on('end', _ => {
+    inputString = inputString.trim().split('\n').map(string => {
+        return string.trim();
+    });
+
+    main();
+});
+
+function readLine() {
+    return inputString[currentLine++];
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */
+
+function greeting(message) {
+    console.log('Hello, World!');
+    console.log(message);
+}
+
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+function main() {
+    const parameterVariable = readLine();
+
+    greeting(parameterVariable);
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */

hackerrank/10 Days of JavaScript/1 - Arthmetic.js

@@ -0,0 +1,47 @@
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+'use strict';
+
+process.stdin.resume();
+process.stdin.setEncoding('utf-8');
+
+let inputString = '';
+let currentLine = 0;
+
+process.stdin.on('data', inputStdin => {
+    inputString += inputStdin;
+});
+
+process.stdin.on('end', _ => {
+    inputString = inputString.trim().split('\n').map(string => {
+        return string.trim();
+    });
+
+    main();
+});
+
+function readLine() {
+    return inputString[currentLine++];
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */
+
+function getArea(length, width) {
+    return length * width;
+}
+
+function getPerimeter(length, width) {
+    return 2 * (length + width);
+}
+
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+function main() {
+    const length = +(readLine());
+    const width = +(readLine());
+
+    console.log(getArea(length, width));
+    console.log(getPerimeter(length, width));
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */

hackerrank/10 Days of JavaScript/1 - Fnxn.js

@@ -0,0 +1,47 @@
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+'use strict';
+
+process.stdin.resume();
+process.stdin.setEncoding('utf-8');
+
+let inputString = '';
+let currentLine = 0;
+
+process.stdin.on('data', inputStdin => {
+    inputString += inputStdin;
+});
+
+process.stdin.on('end', _ => {
+    inputString = inputString.trim().split('\n').map(string => {
+        return string.trim();
+    });
+
+    main();
+});
+
+function readLine() {
+    return inputString[currentLine++];
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */
+
+function factorial(n) {
+    if (n < 0) {
+        throw "Input to 'factorial()' must be non-negative";
+    } else if (n == 0 || n == 1) {
+        return 1;
+    } else {
+        return n * factorial(n - 1);
+    }
+}
+
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+function main() {
+    const n = +(readLine());
+
+    console.log(factorial(n));
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */

hackerrank/10 Days of JavaScript/1 - Let.js

@@ -0,0 +1,48 @@
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+'use strict';
+
+process.stdin.resume();
+process.stdin.setEncoding('utf-8');
+
+let inputString = '';
+let currentLine = 0;
+
+process.stdin.on('data', inputStdin => {
+    inputString += inputStdin;
+});
+
+process.stdin.on('end', _ => {
+    inputString = inputString.trim().split('\n').map(string => {
+        return string.trim();
+    });
+
+    main();
+});
+
+function readLine() {
+    return inputString[currentLine++];
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */
+
+function main() {
+    const PI = Math.PI;
+    const r = parseFloat(readLine());
+
+    console.log(PI * (r ** 2));
+    console.log(2 * PI * r);
+
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+    try {
+        // Attempt to redefine the value of constant variable PI
+        PI = 0;
+        // Attempt to print the value of PI
+        console.log(PI);
+    } catch(error) {
+        console.error("You correctly declared 'PI' as a constant.");
+    }
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */

hackerrank/10 Days of JavaScript/2 - If.js

@@ -0,0 +1,61 @@
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+'use strict';
+
+process.stdin.resume();
+process.stdin.setEncoding('utf-8');
+
+let inputString = '';
+let currentLine = 0;
+
+process.stdin.on('data', inputStdin => {
+    inputString += inputStdin;
+});
+
+process.stdin.on('end', _ => {
+    inputString = inputString.trim().split('\n').map(string => {
+        return string.trim();
+    });
+
+    main();    
+});
+
+function readLine() {
+    return inputString[currentLine++];
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */
+
+function getGrade(score) {
+    let grade;
+
+    if (score > 30) {
+        throw "score must be <= 30";
+    } else if (score > 25) {
+        grade = 'A';
+    } else if (score > 20) {
+        grade = 'B';
+    } else if (score > 15) {
+        grade = 'C';
+    } else if (score > 10) {
+        grade = 'D';
+    } else if (score > 5) {
+        grade = 'E';
+    } else if (score >= 0) {
+        grade = 'F';
+    } else {
+        throw "score must be non-negative";
+    }
+
+    return grade;
+}
+
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+function main() {
+    const score = +(readLine());
+
+    console.log(getGrade(score));
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */

hackerrank/10 Days of JavaScript/2 - Loop.js

@@ -0,0 +1,58 @@
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+'use strict';
+
+process.stdin.resume();
+process.stdin.setEncoding('utf-8');
+
+let inputString = '';
+let currentLine = 0;
+
+process.stdin.on('data', inputStdin => {
+    inputString += inputStdin;
+});
+
+process.stdin.on('end', _ => {
+    inputString = inputString.trim().split('\n').map(string => {
+        return string.trim();
+    });
+
+    main();
+});
+
+function readLine() {
+    return inputString[currentLine++];
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */
+
+function isVowel(ch) {
+    ch = ch.toLowerCase();
+    return ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u';
+}
+
+function vowelsAndConsonants(s) {
+    let vowels = [];
+    let consonants = [];
+
+    for (let ch of s) {
+        if (isVowel(ch)) {
+            vowels.push(ch);
+        } else {
+            consonants.push(ch);
+        }
+    }
+
+    console.log(vowels.join('\n'));
+    console.log(consonants.join('\n'));
+}
+
+/* ************************************************************************** */
+/* --------------------------- begin locked code ---------------------------- */
+function main() {
+    const s = readLine();
+
+    vowelsAndConsonants(s);
+}
+/* ---------------------------- end locked code ----------------------------- */
+/* ************************************************************************** */