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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Range</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| </head> | |
| <body> | |
| <script> | |
| /** | |
| * Create a range of numbers | |
| * Adapted with permission from Darren Jones, https://www.amazon.com/Learn-Code-JavaScript-Darren-Jones/dp/1925836401 | |
| * (c) Chris Ferdinandi, MIT License, https://gomakethings.com | |
| * @param {Number} min The first number in the range | |
| * @param {Number} max The last number in the range | |
| * @return {Array} The range | |
| */ | |
| function range (min, max) { | |
| // If only one number is provided, start at one | |
| if (max === undefined) { | |
| max = min; | |
| min = 1; | |
| } | |
| // Create a ranged array | |
| return Array.from(new Array(max - min + 1).keys()).map(function (num) { | |
| return num + min; | |
| }); | |
| } | |
| // returns [1,2,3,4,5,6,7] | |
| let first = range(7); | |
| // returns [4,5,6,7,8,9,10,11,12] | |
| let second = range(4, 12); | |
| // returns [-12,-11,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7] | |
| let third = range(-12, 7); | |
| console.log(first, second, third); | |
| </script> | |
| </body> | |
| </html> |
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