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Ingy döt Net
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function luckyNumbers(opts={}) {
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/**************************************************************************\
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| OPTIONS |
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|**************************************************************************|
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| even ...... boolean ............. return even/uneven numbers |
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| (default: false) |
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| |
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| nth ....... number ............... return nth number |
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| |
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| through ... number ............... return numbers from #1 to number |
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| OR array[from, to] ... return numbers on index |
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| from array[from] to array[to] |
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| |
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| range ..... array[from, to] ...... return numbers between from and to |
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\**************************************************************************/
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opts.even = opts.even || false;
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if (typeof opts.through == 'number') opts.through = [0, opts.through];
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let out = [],
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x = opts.even ? 2 : 1,
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max = opts.range ? opts.range[1] * 3
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: opts.through ? opts.through[1] * 12
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: opts.nth ? opts.nth * 15
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: 2000;
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for (x; x <= max; x = x+2) out.push(x); // fill
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for (x = 1; x < Math.floor(out.length / 2); x++) { // sieve
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let i = out.length;
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while (i--)
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(i+1) % out[x] == 0 && out.splice(i, 1);
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}
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if (opts.nth) return out[opts.nth-1];
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if (opts.through) return out.slice(opts.through[0], opts.through[1]);
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if (opts.range) return out.filter(function(val) {
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return val >= opts.range[0] && val <= opts.range[1];
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});
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return out;
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}
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/* TESTING */
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// blank
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console.log( luckyNumbers() );
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// showing the first twenty lucky numbers
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console.log( luckyNumbers({through: 20}) );
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// showing the first twenty even lucky numbers
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console.log( luckyNumbers({even: true, through: 20}) );
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// showing all lucky numbers between 6,000 and 6,100 (inclusive)
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console.log( luckyNumbers({range: [6000, 6100]}) );
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// showing all even lucky numbers in the same range as above
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console.log( luckyNumbers({even: true, range: [6000, 6100]}) );
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// showing the 10,000th lucky number (extra credit)
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console.log( luckyNumbers({nth: 10000}) );
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// showing the 10,000th even lucky number (extra credit)
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console.log( luckyNumbers({even: true, nth: 10000}) );
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@ -0,0 +1,88 @@
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(function() {
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document.write(`
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<table>
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<tr><th>argument(s)<br>space separated</th><th>gives</th></tr>
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<tr><td>$j</td><td><i>j</i><sup>th</sup> lucky number</tr>
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<tr><td>$j lucky</td><td><i>j</i><sup>th</sup> lucky number</tr>
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<tr><td>$j evenLucky</td><td><i>j</i><sup>th</sup> even lucky number</tr>
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<tr><td> </td><td> </td></tr>
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<tr><td>$j $k</td><td><i>J</i><sup>th</sup> through <i>k</i><sup>th</sup> (inclusive) lucky numbers</td></tr>
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<tr><td>$j $k lucky</td><td><i>J</i><sup>th</sup> through <i>k</i><sup>th</sup> (inclusive) lucky numbers</td></tr>
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<tr><td>$j $k evenLucky</td><td><i>J</i><sup>th</sup> through <i>k</i><sup>th</sup> (inclusive) even lucky numbers</td></tr>
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<tr><td> </td><td> </td></tr>
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<tr><td>-$j</td><td>all lucky numbers in the range 1 .. |<i>j</i>|*</tr>
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<tr><td>$j -$k</td><td>all lucky numbers in the range <i>j</i> .. |<i>k</i>|*</tr>
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<tr><td>$j -$k lucky</td><td>all lucky numbers in the range <i>j</i> .. |<i>k</i>|*</tr>
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<tr><td>$j -$k evenLucky</td><td>all even lucky numbers in the range <i>j</i> .. |<i>k</i>|*</tr>
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</table>
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<p>* where |<i>x</i>| is the absolute value of <i>x</i></p>
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`);
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let args = prompt('Enter a luckyNumbers argument string:').split(' '),
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numbers = [],
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strings = [],
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obj = {}, // object to pass to our luckyNumbers function
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msg = '';
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for (let x = 0; x < args.length; x++) {
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if (isNaN(parseInt(args[x]))) strings.push(args[x].toUpperCase());
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else numbers.push(parseInt(args[x]));
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}
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// check strings
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switch (true) {
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case (strings.length > 1):
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msg += 'Too many arguments.';
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break;
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case (strings.length == 0): break;
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case (strings[0] != 'LUCKY' && strings[0] != 'EVENLUCKY'):
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msg += `Unknown argument: ${strings[0]}.`;
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break;
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case (strings[0] == 'EVENLUCKY'): obj.even = true;
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}
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// check numbers
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switch (true) {
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case (numbers.length == 0):
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msg += 'Missing number argument.';
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break;
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case (numbers.length > 2):
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msg += 'Too many number arguments.';
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break;
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case (numbers.length == 1):
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if (numbers[0] > 0) obj.nth = numbers[0];
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else obj.through = Math.abs(numbers[0]);
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break;
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case (numbers.length == 2):
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// both negative
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if (numbers[0] < 0 && numbers[1] < 0) {
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msg += 'Missing positive argument';
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break;
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}
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// negative + positive
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numbers.sort();
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if (numbers[0] < 0 && numbers[1] > 0) {
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obj.range = [numbers[1], Math.abs(numbers[0])];
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break;
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}
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// both positive
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if (numbers[0] > 0 && numbers[1] > 0) {
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obj.through = [numbers[0]-1, numbers[1]];
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}
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}
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if (msg.length > 0)
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document.write(`<p>${msg}<br>Reload to try again</p>`);
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else {
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let res;
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try { res = luckyNumbers(obj); }
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catch (err) {
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document.write(`<p>${err}<br>Reload to try again</p>`);
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}
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finally {
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if (typeof res == 'object' ) res = res.join(', ');
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document.write(`
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<p>
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<b>Input: </b>${args.join(' ')}<br>
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<b>Result: </b>${res}
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</p>
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<p>Reload to continue</p>
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`)
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}
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}
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})();
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