DCC-25.js

// Prompt:

// - Write a function called getNumForIP that accepts a single string as argument.
// - The input string is formatted as an IP address, such as '192.156.99.15'.  IP addresses are used in networking and are actually 32-bit integers.  However, those that work with networks find it more convenient to work with these numbers as four 8-bit integers, separated by a 'dot' character.
// - The getNumForIP function should return the numeric value of the string IP address being passed in as an argument.

// Hints:

// - Each 8-bit number can hold a value between 0 and 256.
// - An IP's right most 8-bit number represents how many of 256 raised to the power of 0 (equals 1) there are.  The next 8-bit number represents how many of 256 raised to the power of 1 (256) there are, etc.  For example, if you took the right-most two 8-bit numbers of the IP address 192.156.99.15, you would have 15 * (256 ** 0), which equals 15, and 99 * (256**1), which equals 25344.
// - To compute the numeric value for an IP address, you first compute the value for each of the four 8-bit chunks (as described in the above hint), and add them together!

// Examples:

// getNumForIP( '0.0.0.1' ) // => 1
// getNumForIP( '0.0.2.0' ) // => 512
// getNumForIP( '192.156.99.15' ) // => 3231474447
// getNumForIP( '10.0.0.1' ) // => 167772161

const getNumForIP = (ip) => {
	const nums = ip.split(".").map((num) => parseInt(num));
	return nums.reduce(
		(total, num, index) => total + num * 256 ** (3 - index),
		0
	);
};