JavaScript Katas

JavaScript practice exercises.

How to run the tests

In the directory of the exercise, run:

npm install
npm test

Fuzzy Time

Write a function that takes a time in a numeric format, such as '13:04', and returns the time as a string spelled out in english, such as 'five after 1'.

Merge Overlapping Intervals

https://blog.svpino.com/2015/05/17/programming-challenge-merging-overlapping-intervals

Given a collection of intervals, write a function that merges all overlapping intervals and prints them out.

For example, given [1, 3], [2, 6], [8, 10], and [7, 11], the function should print [1, 6], [7, 11]. Or given [5, 12], and [8, 10] the function should print [5, 12].

You can assume that the first element of each interval is always less or equal than the second element of the interval.

Langton's Ant

From Cracking the Coding Interview

Ideas

Celsius to Fahrenheit

Write a JavaScript program to convert temperatures to and from celsius, fahrenheit.

Formula:

°C x 9/5 + 32 = °F (°F - 32) x 5/9 = °C

Example:

37°C x 9/5 + 32 = 98.6°F 37°C = 98.6°F

Reverse Numbers

Write a JavaScript function that reverse a number. Go to the editor Example:

Input: x = 32243;

Output: 34223

JSBIN url generator

Write a JavaScript function that will randomly generate a 6 character string that alternates between consonants and vowels.

List of consonants: B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, X, Y, Z

List of vowels: A, E, I, O, U

Examples: fabuti, nitize, taqake, wuwuya

Table Generator

Write a function that will generate a table that is a user-specified number of rows and columns.

Input:

number of rows number of columns character to use Example: createTable(5, 5, 'm')

Output:

mmmmm mmmmm mmmmm mmmmm mmmmm

Table Generator (Version 2)

Write a function that will generate a table of alternating characters of 'x' and 'o' based on a user-specified number of rows and columns.

Input:

number of rows number of columns Example: createTable(5, 5)

Output:

xoxox oxoxo xoxox oxoxo xoxox

Fibonacci calculator

You need to implement Fibonacci number calculator in JavaScript. You should be able to change the index. The Fibonacci sequence follows those rules:

The first two numbers of the sequence are 0 and 1, Each subsequent number is the sum of the previous two.

Example: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34...

Input: 3

Output: 2

(Extra credit: Try to solve the problem by using recursion.)