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#!/usr/bin/env node
// ch-1.js
/**
* https://theweeklychallenge.org/blog/perl-weekly-challenge-133/
*
* Task 1 > Integer Square Root
* ============================
*
* You are given a positive integer `$N`.
*
* Write a script to calculate the integer square root of the given number.
*
* Please avoid using built-in function. Find out more about it here
* (https://en.wikipedia.org/wiki/Integer_square_root).
*
* Examples
* --------
*
* Input: $N = 10
* Output: 3
*
* Input: $N = 27
* Output: 5
*
* Input: $N = 85
* Output: 9
*
* Input: $N = 101
* Output: 10
*
**/
'use strict';
/**
* Node built-in dependencies
**/
const readline = require('readline');
/**
* Our PWC solution
**/
function returnIntSqrRoot(input) {
// Validate input
if (!Number.isInteger(+input) || +input < 0) {
throw new Error(
'returnIntSqrRoot expects a positive integer as an argument',
);
}
// Crawl through squares starting with 0
let i = 0;
while (i * i <= +input) {
i += 1;
}
// return the highest passing number
i -= 1;
return i;
}
/**
* Utilities
**/
function repl() {
return new Promise((resolve) => {
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
});
rl.setPrompt(
'Enter a positive integer (or, type "\x1b[33mexit\x1b[0m" to quit)> ',
);
rl.prompt();
rl.on('line', (line) => {
const trimmed = line.trim();
if (trimmed === 'exit' || trimmed === 'n') {
return rl.close();
}
if (trimmed === 'y') return rl.prompt();
if (Number.isInteger(+trimmed)) {
console.log('Integer square root:', returnIntSqrRoot(+trimmed));
} else {
console.log('Arguments must be positive integers only.');
}
return process.stdout.write(
'Try again? (\x1b[33my\x1b[0m/\x1b[33mn\x1b[0m)> ',
);
}).on('close', () => {
console.log('Goodbye.');
resolve();
});
});
}
function printBanner() {
const message = 'Integer Square Root Calculator';
const outline = '='.repeat(message.length);
const fgCyan = '\x1b[36m';
const reset = '\x1b[0m';
const banner = `\n${outline}\n${message}\n${outline}\n`;
console.log(fgCyan + banner + reset);
}
(async function main() {
try {
printBanner();
await repl();
} catch (error) {
console.log(error);
process.exit(1);
}
})();
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